diff --git a/src/App.vue b/src/App.vue
index 186feca95f..1495f23fbd 100644
--- a/src/App.vue
+++ b/src/App.vue
@@ -115,6 +115,7 @@ const { onExecuteSql, onReloadData, onPaginate, onSort } = useDataGridActions(ac
 const { setupTauriListeners } = useTauriEvents({ openTableTarget });
 
 const appVersion = ref("");
+const isClassicLayout = computed(() => settingsStore.editorSettings.appLayout === "classic");
 const hasSqlFileConnections = computed(() =>
   connectionStore.connections.some((c) => !SQL_FILE_UNSUPPORTED_TYPES.has(c.db_type)),
 );
@@ -511,15 +512,28 @@ onUnmounted(() => {
           @open-sql-file="dialogs.showSqlFileDialog.value = true"
         />
 
-        <div class="app-panel-gutter flex-1 flex min-h-0 gap-1 p-1">
+        <div
+          :class="
+            isClassicLayout
+              ? 'app-layout-classic flex-1 flex min-h-0'
+              : 'app-panel-gutter flex-1 flex min-h-0 gap-1 p-1'
+          "
+        >
           <AppSidebar
             :sidebar-width="sidebarWidth"
+            :classic-layout="isClassicLayout"
             @import="dialogs.onImportClick"
             @export="dialogs.onExportClick"
             @start-resize="startSidebarResize"
           />
 
-          <div class="flex-1 min-w-0 overflow-hidden rounded-md border border-border/80 bg-background">
+          <div
+            :class="
+              isClassicLayout
+                ? 'flex-1 min-w-0'
+                : 'flex-1 min-w-0 overflow-hidden rounded-md border border-border/80 bg-background'
+            "
+          >
             <div class="h-full flex flex-col min-w-0">
               <AppTabBar />
               <div v-if="activeTab" class="flex flex-col flex-1 min-h-0">
@@ -590,7 +604,11 @@ onUnmounted(() => {
 
           <div
             v-if="showAiPanel"
-            class="h-full shrink-0 relative overflow-hidden rounded-md border border-border/80 bg-background"
+            :class="
+              isClassicLayout
+                ? 'h-full shrink-0 relative bg-background'
+                : 'h-full shrink-0 relative overflow-hidden rounded-md border border-border/80 bg-background'
+            "
             :style="{ width: aiPanelWidth + 'px' }"
           >
             <div class="panel-resize-handle panel-resize-handle--left" @mousedown="startAiPanelResize" />
@@ -608,7 +626,11 @@ onUnmounted(() => {
 
           <div
             v-if="showHistory"
-            class="h-full shrink-0 relative overflow-hidden rounded-md border border-border/80 bg-background"
+            :class="
+              isClassicLayout
+                ? 'h-full shrink-0 relative bg-background'
+                : 'h-full shrink-0 relative overflow-hidden rounded-md border border-border/80 bg-background'
+            "
             :style="{ width: historyWidth + 'px' }"
           >
             <div class="panel-resize-handle panel-resize-handle--left" @mousedown="startHistoryResize" />
diff --git a/src/components/editor/AiAssistant.vue b/src/components/editor/AiAssistant.vue
index 65910b3f13..d1a77cb9c6 100644
--- a/src/components/editor/AiAssistant.vue
+++ b/src/components/editor/AiAssistant.vue
@@ -463,7 +463,10 @@ function formatInlineText(text: string): string {
 
 <template>
   <div class="flex h-full min-h-0 flex-col overflow-hidden">
-    <div class="h-10 flex items-center gap-2 border-b px-3 shrink-0">
+    <div
+      class="flex items-center gap-2 border-b px-3 shrink-0"
+      :class="settings.editorSettings.appLayout === 'classic' ? 'h-9' : 'h-10'"
+    >
       <span class="flex-1 truncate text-xs font-medium">{{ chatTitle }}</span>
       <Button variant="ghost" size="icon" class="h-6 w-6" @click="startNewChat" :title="t('ai.newChat')">
         <MessageSquarePlus class="h-3.5 w-3.5" />
diff --git a/src/components/editor/EditorSettingsDialog.vue b/src/components/editor/EditorSettingsDialog.vue
index 2a8b07c6b4..6cde2b78c7 100644
--- a/src/components/editor/EditorSettingsDialog.vue
+++ b/src/components/editor/EditorSettingsDialog.vue
@@ -31,6 +31,7 @@ const editFontSize = ref(settingsStore.editorSettings.fontSize);
 const editTheme = ref(settingsStore.editorSettings.theme);
 const editExecuteMode = ref(settingsStore.editorSettings.executeMode);
 const editWordWrap = ref(settingsStore.editorSettings.wordWrap);
+const editAppLayout = ref(settingsStore.editorSettings.appLayout);
 
 // Sync from store when dialog opens
 watch(
@@ -42,6 +43,7 @@ watch(
       editTheme.value = settingsStore.editorSettings.theme;
       editExecuteMode.value = settingsStore.editorSettings.executeMode;
       editWordWrap.value = settingsStore.editorSettings.wordWrap;
+      editAppLayout.value = settingsStore.editorSettings.appLayout;
     }
   },
 );
@@ -52,7 +54,8 @@ function hasChanges(): boolean {
     editFontSize.value !== settingsStore.editorSettings.fontSize ||
     editTheme.value !== settingsStore.editorSettings.theme ||
     editExecuteMode.value !== settingsStore.editorSettings.executeMode ||
-    editWordWrap.value !== settingsStore.editorSettings.wordWrap
+    editWordWrap.value !== settingsStore.editorSettings.wordWrap ||
+    editAppLayout.value !== settingsStore.editorSettings.appLayout
   );
 }
 
@@ -63,6 +66,7 @@ function applySettings() {
     theme: editTheme.value,
     executeMode: editExecuteMode.value,
     wordWrap: editWordWrap.value,
+    appLayout: editAppLayout.value,
   });
   emit("update:open", false);
 }
@@ -73,6 +77,7 @@ function resetDefaults() {
   editTheme.value = DEFAULT_EDITOR_SETTINGS.theme;
   editExecuteMode.value = DEFAULT_EDITOR_SETTINGS.executeMode;
   editWordWrap.value = DEFAULT_EDITOR_SETTINGS.wordWrap;
+  editAppLayout.value = DEFAULT_EDITOR_SETTINGS.appLayout;
 }
 
 function onExecuteModeChange(v: any) {
@@ -87,6 +92,10 @@ function onThemeChange(v: any) {
   if (typeof v === "string") editTheme.value = v as typeof DEFAULT_EDITOR_SETTINGS.theme;
 }
 
+function setAppLayout(value: "separated" | "classic") {
+  editAppLayout.value = value;
+}
+
 const activeSettingsTab = ref("editor");
 const isWeb = !isTauriRuntime();
 
@@ -251,6 +260,7 @@ watch(
       <Tabs v-model="activeSettingsTab">
         <TabsList class="w-full">
           <TabsTrigger value="editor" class="flex-1">{{ t("settings.editorTab") }}</TabsTrigger>
+          <TabsTrigger value="appearance" class="flex-1">{{ t("settings.appearanceTab") }}</TabsTrigger>
           <TabsTrigger v-if="isWeb" value="security" class="flex-1">{{ t("settings.securityTab") }}</TabsTrigger>
           <TabsTrigger value="about" class="flex-1">{{ t("settings.aboutTab") }}</TabsTrigger>
         </TabsList>
@@ -330,6 +340,8 @@ watch(
             </Select>
           </div>
 
+          <Separator />
+
           <div class="space-y-2">
             <Label>{{ t("settings.executeMode") }}</Label>
             <Select :model-value="editExecuteMode" @update:model-value="onExecuteModeChange">
@@ -384,6 +396,52 @@ watch(
           </DialogFooter>
         </TabsContent>
 
+        <TabsContent value="appearance" class="space-y-5 py-2">
+          <div class="space-y-2">
+            <Label>{{ t("settings.appLayout") }}</Label>
+            <p class="text-xs text-muted-foreground">{{ t("settings.appLayoutDescription") }}</p>
+            <div class="grid grid-cols-2 gap-2">
+              <Button
+                type="button"
+                variant="outline"
+                class="h-auto justify-start p-3"
+                :class="editAppLayout === 'separated' ? 'border-primary bg-primary/10' : ''"
+                @click="setAppLayout('separated')"
+              >
+                <div class="text-left">
+                  <div class="text-sm font-medium">{{ t("settings.appLayoutSeparated") }}</div>
+                  <div class="text-xs text-muted-foreground">{{ t("settings.appLayoutSeparatedDescription") }}</div>
+                </div>
+              </Button>
+              <Button
+                type="button"
+                variant="outline"
+                class="h-auto justify-start p-3"
+                :class="editAppLayout === 'classic' ? 'border-primary bg-primary/10' : ''"
+                @click="setAppLayout('classic')"
+              >
+                <div class="text-left">
+                  <div class="text-sm font-medium">{{ t("settings.appLayoutClassic") }}</div>
+                  <div class="text-xs text-muted-foreground">{{ t("settings.appLayoutClassicDescription") }}</div>
+                </div>
+              </Button>
+            </div>
+          </div>
+
+          <DialogFooter class="border-t-0 bg-transparent gap-2 sm:gap-0">
+            <Button variant="outline" @click="resetDefaults">
+              {{ t("settings.resetDefaults") }}
+            </Button>
+            <div class="flex-1" />
+            <Button variant="outline" @click="emit('update:open', false)">
+              {{ t("common.close") }}
+            </Button>
+            <Button :disabled="!hasChanges()" @click="applySettings">
+              {{ t("settings.apply") }}
+            </Button>
+          </DialogFooter>
+        </TabsContent>
+
         <TabsContent v-if="isWeb" value="security" class="space-y-5 py-2">
           <div class="space-y-3">
             <Label class="text-base">{{ t("auth.changePassword") }}</Label>
diff --git a/src/components/layout/AppSidebar.vue b/src/components/layout/AppSidebar.vue
index ac9fa871c1..48f22c3899 100644
--- a/src/components/layout/AppSidebar.vue
+++ b/src/components/layout/AppSidebar.vue
@@ -9,6 +9,7 @@ import { useToast } from "@/composables/useToast";
 
 defineProps<{
   sidebarWidth: number;
+  classicLayout?: boolean;
 }>();
 
 const emit = defineEmits<{
@@ -32,11 +33,15 @@ async function refreshTree() {
 
 <template>
   <div
-    class="h-full shrink-0 relative select-none overflow-hidden rounded-md border border-border/80 bg-background"
+    class="h-full shrink-0 relative select-none"
+    :class="classicLayout ? '' : 'overflow-hidden rounded-md border border-border/80 bg-background'"
     :style="{ width: sidebarWidth + 'px' }"
   >
     <div class="h-full flex flex-col overflow-hidden">
-      <div class="h-10 flex items-center px-3 text-xs font-medium text-muted-foreground border-b bg-muted/20">
+      <div
+        class="flex items-center px-3 text-xs font-medium text-muted-foreground border-b bg-muted/20"
+        :class="classicLayout ? 'h-9' : 'h-10'"
+      >
         {{ t("sidebar.connections") }}
         <span class="flex-1" />
         <Tooltip>
diff --git a/src/components/layout/AppTabBar.vue b/src/components/layout/AppTabBar.vue
index 9e5b2a5438..23d2945eba 100644
--- a/src/components/layout/AppTabBar.vue
+++ b/src/components/layout/AppTabBar.vue
@@ -11,6 +11,7 @@ import {
 } from "@/components/ui/context-menu";
 import { Tooltip, TooltipTrigger, TooltipContent } from "@/components/ui/tooltip";
 import { useQueryStore } from "@/stores/queryStore";
+import { useSettingsStore } from "@/stores/settingsStore";
 import { useTabScroll } from "@/composables/useTabScroll";
 import { connectionColor, tabDisplayTitle, tabTooltipLines } from "@/lib/tabPresentation";
 import { hexToRgba } from "@/lib/color";
@@ -18,6 +19,7 @@ import type { QueryTab } from "@/types/database";
 
 const { t } = useI18n();
 const queryStore = useQueryStore();
+const settingsStore = useSettingsStore();
 
 const tabsContainerRef = ref<HTMLElement | null>(null);
 const { canScrollLeft, canScrollRight, updateScrollButtons, scrollTabs } = useTabScroll(tabsContainerRef);
@@ -47,8 +49,23 @@ watch(
 function tabColorStyle(tab: QueryTab) {
   const color = connectionColor(tab.connectionId);
   const isActive = tab.id === queryStore.activeTabId;
+  const isClassic = settingsStore.editorSettings.appLayout === "classic";
   if (!color) {
-    return isActive ? { borderColor: "var(--ring)" } : undefined;
+    if (isClassic) {
+      return isActive ? { boxShadow: "0 1px 0 0 var(--color-background)" } : undefined;
+    }
+    return isActive
+      ? {
+          borderColor: "var(--ring)",
+        }
+      : undefined;
+  }
+
+  if (isClassic) {
+    return {
+      backgroundColor: hexToRgba(color, isActive ? 0.16 : 0.07),
+      boxShadow: isActive ? `inset 0 -2px 0 ${color}` : undefined,
+    };
   }
 
   return {
@@ -59,7 +76,15 @@ function tabColorStyle(tab: QueryTab) {
 </script>
 
 <template>
-  <div v-if="queryStore.tabs.length > 0" class="relative h-10 flex items-center border-b bg-background px-2 shrink-0">
+  <div
+    v-if="queryStore.tabs.length > 0"
+    class="relative flex border-b shrink-0"
+    :class="
+      settingsStore.editorSettings.appLayout === 'classic'
+        ? 'h-9 items-stretch bg-muted'
+        : 'h-10 items-center bg-background px-2'
+    "
+  >
     <button
       v-if="canScrollLeft"
       class="absolute left-0 z-10 h-full pl-1 pr-6 bg-linear-to-r from-background from-40% to-transparent text-muted-foreground hover:text-foreground"
@@ -70,20 +95,31 @@ function tabColorStyle(tab: QueryTab) {
     </button>
     <div
       ref="tabsContainerRef"
-      class="flex-1 flex items-center gap-1.5 overflow-x-auto min-w-0"
+      class="flex-1 flex items-center overflow-x-auto min-w-0"
+      :class="settingsStore.editorSettings.appLayout === 'classic' ? '' : 'gap-1.5'"
       style="-ms-overflow-style: none; scrollbar-width: none; -webkit-overflow-scrolling: touch"
       @scroll="updateScrollButtons"
     >
       <ContextMenu v-for="tab in queryStore.tabs" :key="tab.id">
-        <ContextMenuTrigger>
+        <ContextMenuTrigger :class="settingsStore.editorSettings.appLayout === 'classic' ? 'h-full' : ''">
           <Tooltip>
             <TooltipTrigger as-child>
               <div
-                class="group flex h-7 min-w-38 items-center gap-1 rounded-md border px-2 text-xs cursor-pointer transition-colors whitespace-nowrap"
+                class="group flex min-w-38 items-center gap-1 px-2 text-xs cursor-pointer transition-colors whitespace-nowrap"
                 :class="
-                  tab.id === queryStore.activeTabId
-                    ? 'text-foreground font-medium'
-                    : 'border-border/60 text-foreground/70 hover:border-border hover:text-foreground/90'
+                  settingsStore.editorSettings.appLayout === 'classic'
+                    ? [
+                        'h-full border-r border-border/50',
+                        tab.id === queryStore.activeTabId
+                          ? 'bg-background text-foreground font-medium'
+                          : 'text-foreground/70 hover:text-foreground/90',
+                      ]
+                    : [
+                        'h-7 rounded-md border',
+                        tab.id === queryStore.activeTabId
+                          ? 'text-foreground font-medium'
+                          : 'border-border/60 text-foreground/70 hover:border-border hover:text-foreground/90',
+                      ]
                 "
                 :style="tabColorStyle(tab)"
                 :data-active-tab="tab.id === queryStore.activeTabId"
diff --git a/src/components/sidebar/TreeItem.vue b/src/components/sidebar/TreeItem.vue
index 84e76891be..d43dfe2ffa 100644
--- a/src/components/sidebar/TreeItem.vue
+++ b/src/components/sidebar/TreeItem.vue
@@ -1349,11 +1349,6 @@ const isDragging = computed(() => dragState.active && dragState.draggedId === pr
             class="w-3.5 h-3.5 shrink-0"
             :class="getIconInfo(node)?.colorClass"
           />
-          <span
-            v-if="node.type === 'connection'"
-            class="h-3 w-1.5 rounded-full shrink-0"
-            :style="{ backgroundColor: connectionColor || '#9ca3af' }"
-          />
           <input
             v-if="isRenamingGroup"
             v-model="renameInput"
diff --git a/src/i18n/locales/en.ts b/src/i18n/locales/en.ts
index 1721f055ba..5a4206214c 100644
--- a/src/i18n/locales/en.ts
+++ b/src/i18n/locales/en.ts
@@ -784,6 +784,7 @@ export default {
   settings: {
     title: "Settings",
     editorTab: "Editor",
+    appearanceTab: "Appearance",
     securityTab: "Security",
     aboutTab: "About",
     fontFamily: "Font Family",
@@ -791,6 +792,12 @@ export default {
     fontSize: "Font Size",
     theme: "Theme",
     selectTheme: "Select theme...",
+    appLayout: "Interface Layout",
+    appLayoutDescription: "Choose the main panel spacing, tab style, and header density.",
+    appLayoutSeparated: "Modern separated",
+    appLayoutSeparatedDescription: "Clear panel separation with block-style tabs.",
+    appLayoutClassic: "Classic compact",
+    appLayoutClassicDescription: "Continuous tab bar with compact panel headers.",
     apply: "Apply",
     resetDefaults: "Reset Defaults",
     executeMode: "Execute Mode (Cmd+Enter)",
diff --git a/src/i18n/locales/zh-CN.ts b/src/i18n/locales/zh-CN.ts
index 50114b2914..0ecd1a0578 100644
--- a/src/i18n/locales/zh-CN.ts
+++ b/src/i18n/locales/zh-CN.ts
@@ -771,6 +771,7 @@ export default {
   settings: {
     title: "设置",
     editorTab: "编辑器",
+    appearanceTab: "外观",
     securityTab: "安全",
     aboutTab: "关于我们",
     fontFamily: "字体",
@@ -778,6 +779,12 @@ export default {
     fontSize: "字号",
     theme: "主题",
     selectTheme: "选择主题...",
+    appLayout: "界面布局",
+    appLayoutDescription: "选择主界面的面板分隔、标签页和标题栏样式。",
+    appLayoutSeparated: "现代分隔",
+    appLayoutSeparatedDescription: "面板分隔更清晰，标签页为块状样式。",
+    appLayoutClassic: "经典紧凑",
+    appLayoutClassicDescription: "使用连续标签栏和更紧凑的面板标题。",
     apply: "应用",
     resetDefaults: "恢复默认",
     executeMode: "执行模式 (Cmd+Enter)",
diff --git a/src/stores/settingsStore.ts b/src/stores/settingsStore.ts
index 7d375900a4..df8dd2cf5b 100644
--- a/src/stores/settingsStore.ts
+++ b/src/stores/settingsStore.ts
@@ -46,6 +46,7 @@ export interface EditorSettings {
   theme: EditorTheme;
   executeMode: "all" | "current";
   wordWrap: boolean;
+  appLayout: "separated" | "classic";
 }
 
 export const EDITOR_THEMES: { value: EditorTheme; label: string; dark: boolean }[] = [
@@ -76,6 +77,7 @@ export const DEFAULT_EDITOR_SETTINGS: EditorSettings = {
   theme: "one-dark",
   executeMode: "all",
   wordWrap: false,
+  appLayout: "classic",
 };
 
 export const STORAGE_KEY = "dbx-editor-settings";
@@ -93,6 +95,7 @@ function loadEditorSettings(): EditorSettings {
         theme: parsed.theme ?? DEFAULT_EDITOR_SETTINGS.theme,
         executeMode: parsed.executeMode ?? DEFAULT_EDITOR_SETTINGS.executeMode,
         wordWrap: parsed.wordWrap ?? DEFAULT_EDITOR_SETTINGS.wordWrap,
+        appLayout: parsed.appLayout ?? DEFAULT_EDITOR_SETTINGS.appLayout,
       };
     }
   } catch {
diff --git a/src/styles/globals.css b/src/styles/globals.css
index 3a3d284032..02b4efc271 100644
--- a/src/styles/globals.css
+++ b/src/styles/globals.css
@@ -168,6 +168,24 @@
 .dark .app-panel-gutter {
   background: oklch(0.18 0 0);
 }
+.app-layout-classic .panel-resize-handle {
+  width: 3px;
+}
+.app-layout-classic .panel-resize-handle--right {
+  right: 0;
+  border-right: 1px solid var(--border);
+}
+.app-layout-classic .panel-resize-handle--left {
+  left: 0;
+  border-left: 1px solid var(--border);
+}
+.app-layout-classic .panel-resize-handle::before {
+  display: none;
+}
+.app-layout-classic .panel-resize-handle:hover,
+.app-layout-classic .panel-resize-handle:active {
+  background: oklch(0.6 0.15 250);
+}
 
 .panel-resize-handle {
   position: absolute;