diff --git a/src/main/persistence.test.ts b/src/main/persistence.test.ts
index fac25b82a..b3f837580 100644
--- a/src/main/persistence.test.ts
+++ b/src/main/persistence.test.ts
@@ -233,7 +233,7 @@ describe('Store', () => {
     const store = await createStore()
     const ui = store.getUI()
     expect(ui.sidebarWidth).toBe(280)
-    expect(ui.groupBy).toBe('repo')
+    expect(ui.groupBy).toBe('workspace-status')
     expect(ui.lastActiveRepoId).toBeNull()
     expect(ui.dismissedUpdateVersion).toBeNull()
     expect(ui.lastUpdateCheckAt).toBeNull()
@@ -1116,7 +1116,7 @@ describe('Store', () => {
     store.updateUI({ sidebarWidth: 400 })
     const ui = store.getUI()
     expect(ui.sidebarWidth).toBe(400)
-    expect(ui.groupBy).toBe('repo') // default preserved
+    expect(ui.groupBy).toBe('workspace-status') // default preserved
     expect(ui.dismissedUpdateVersion).toBeNull()
   })
 
diff --git a/src/renderer/src/components/sidebar/worktree-list-groups.test.ts b/src/renderer/src/components/sidebar/worktree-list-groups.test.ts
index a70e80bd0..dbd736b22 100644
--- a/src/renderer/src/components/sidebar/worktree-list-groups.test.ts
+++ b/src/renderer/src/components/sidebar/worktree-list-groups.test.ts
@@ -3,6 +3,7 @@ import { readFileSync } from 'node:fs'
 import { fileURLToPath } from 'node:url'
 import { describe, expect, it } from 'vitest'
 import {
+  ALL_GROUP_META,
   buildRows,
   getGroupKeyForWorktree,
   getLineageGroupKey,
@@ -55,8 +56,8 @@ describe('getPRGroupKey', () => {
 })
 
 describe('getGroupKeyForWorktree', () => {
-  it('returns no group key for the ungrouped mode', () => {
-    expect(getGroupKeyForWorktree('none', worktree, repoMap, null)).toBeNull()
+  it('returns the all group key for the ungrouped mode', () => {
+    expect(getGroupKeyForWorktree('none', worktree, repoMap, null)).toBe('all')
   })
 
   it('returns a workspace-status key only in status grouping mode', () => {
@@ -71,32 +72,46 @@ describe('buildRows with pinned worktrees', () => {
   const unpinned1 = { ...worktree, id: 'wt-1', displayName: 'alpha' }
   const unpinned2 = { ...worktree, id: 'wt-2', displayName: 'beta' }
 
-  it('emits a Pinned header followed by pinned items in groupBy none', () => {
+  it('emits Pinned and All headers in groupBy none', () => {
     const rows = buildRows('none', [unpinned1, pinned, unpinned2], repoMap, null, new Set())
     expect(rows[0]).toMatchObject({ type: 'header', key: 'pinned', label: 'Pinned', count: 1 })
     expect(rows[1]).toMatchObject({ type: 'item', worktree: { id: 'wt-pinned' } })
+    expect(rows[2]).toMatchObject({ type: 'header', key: 'all', label: 'All', count: 2 })
+    expect(rows[2]).toMatchObject({ type: 'header', icon: ALL_GROUP_META.icon })
   })
 
-  it('renders a flat list without status headers in groupBy none', () => {
+  it('groups all worktrees under All in groupBy none', () => {
     const rows = buildRows('none', [unpinned1, unpinned2], repoMap, null, new Set())
 
     expect(rows).toMatchObject([
+      { type: 'header', key: 'all', label: 'All', count: 2 },
       { type: 'item', worktree: { id: 'wt-1' } },
       { type: 'item', worktree: { id: 'wt-2' } }
     ])
   })
 
-  it('keeps pinned worktrees above the flat list', () => {
+  it('keeps pinned worktrees above the All group', () => {
     const rows = buildRows('none', [unpinned1, pinned, unpinned2], repoMap, null, new Set())
 
     expect(rows).toMatchObject([
       { type: 'header', key: 'pinned', count: 1 },
       { type: 'item', worktree: { id: 'wt-pinned' } },
+      { type: 'header', key: 'all', count: 2 },
       { type: 'item', worktree: { id: 'wt-1' } },
       { type: 'item', worktree: { id: 'wt-2' } }
     ])
   })
 
+  it('collapses the All group in groupBy none', () => {
+    const rows = buildRows('none', [unpinned1, pinned, unpinned2], repoMap, null, new Set(['all']))
+
+    expect(rows).toMatchObject([
+      { type: 'header', key: 'pinned', count: 1 },
+      { type: 'item', worktree: { id: 'wt-pinned' } },
+      { type: 'header', key: 'all', count: 2 }
+    ])
+  })
+
   it('emits status headers for unpinned worktrees in groupBy workspace-status', () => {
     const rows = buildRows(
       'workspace-status',
diff --git a/src/renderer/src/components/sidebar/worktree-list-groups.ts b/src/renderer/src/components/sidebar/worktree-list-groups.ts
index b5def7bf5..ceeed11ab 100644
--- a/src/renderer/src/components/sidebar/worktree-list-groups.ts
+++ b/src/renderer/src/components/sidebar/worktree-list-groups.ts
@@ -1,5 +1,5 @@
 /* eslint-disable max-lines -- Why: sidebar row construction keeps every grouping mode in one pure module so reveal, virtualized rendering, and tests share the same flat row contract. */
-import { CircleX, Folder, Pin } from 'lucide-react'
+import { CircleX, Folder, List, Pin } from 'lucide-react'
 import type React from 'react'
 import type {
   Repo,
@@ -105,6 +105,14 @@ export const PINNED_GROUP_META = {
   icon: Pin
 } as const
 
+export const ALL_GROUP_KEY = 'all'
+
+export const ALL_GROUP_META = {
+  label: 'All',
+  tone: 'text-foreground',
+  icon: List
+} as const
+
 export const MISSING_PARENT_GROUP_META = {
   label: 'Missing parent'
 } as const
@@ -373,11 +381,23 @@ export function buildRows(
   const unpinned = pinnedIds.size > 0 ? worktrees.filter((w) => !pinnedIds.has(w.id)) : worktrees
 
   if (groupBy === 'none') {
-    appendWorktreeRows(result, unpinned, repoMap, lineageById, worktreeMap, {
-      nestLineage,
-      showLineageContext: nestLineage,
-      collapsedGroups
-    })
+    if (unpinned.length > 0) {
+      result.push({
+        type: 'header',
+        key: ALL_GROUP_KEY,
+        label: ALL_GROUP_META.label,
+        count: unpinned.length,
+        tone: ALL_GROUP_META.tone,
+        icon: ALL_GROUP_META.icon
+      })
+      if (!collapsedGroups.has(ALL_GROUP_KEY)) {
+        appendWorktreeRows(result, unpinned, repoMap, lineageById, worktreeMap, {
+          nestLineage,
+          showLineageContext: nestLineage,
+          collapsedGroups
+        })
+      }
+    }
     return result
   }
 
@@ -513,7 +533,7 @@ export function getGroupKeyForWorktree(
   workspaceStatuses: readonly WorkspaceStatusDefinition[] = cloneDefaultWorkspaceStatuses()
 ): string | null {
   if (groupBy === 'none') {
-    return null
+    return ALL_GROUP_KEY
   }
   if (groupBy === 'workspace-status') {
     return getWorkspaceStatusGroupKey(getWorkspaceStatus(worktree, workspaceStatuses))
diff --git a/src/renderer/src/lib/startup-ui-hydration.test.ts b/src/renderer/src/lib/startup-ui-hydration.test.ts
index fd035ed93..6f2bee86b 100644
--- a/src/renderer/src/lib/startup-ui-hydration.test.ts
+++ b/src/renderer/src/lib/startup-ui-hydration.test.ts
@@ -52,7 +52,7 @@ describe('startup UI hydration fallback', () => {
 
     expect(hydratePersistedUI).toHaveBeenCalledTimes(1)
     expect(hydratePersistedUI.mock.calls[0][0].sidebarWidth).toBe(280)
-    expect(hydratePersistedUI.mock.calls[0][0].groupBy).toBe('repo')
+    expect(hydratePersistedUI.mock.calls[0][0].groupBy).toBe('workspace-status')
     expect(hydratePersistedUI.mock.calls[0][0].sortBy).toBe('name')
   })
 
diff --git a/src/renderer/src/lib/startup-ui-hydration.ts b/src/renderer/src/lib/startup-ui-hydration.ts
index 716328785..1906da610 100644
--- a/src/renderer/src/lib/startup-ui-hydration.ts
+++ b/src/renderer/src/lib/startup-ui-hydration.ts
@@ -34,7 +34,7 @@ export function getStartupErrorFallbackUI(uiHydrated: boolean): PersistedUIState
     lastActiveWorktreeId: null,
     sidebarWidth: 280,
     rightSidebarWidth: 350,
-    groupBy: 'repo',
+    groupBy: 'workspace-status',
     sortBy: 'name',
     showActiveOnly: false,
     hideDefaultBranchWorkspace: false,
diff --git a/src/renderer/src/store/slices/ui.ts b/src/renderer/src/store/slices/ui.ts
index 000585a7c..fc60260e0 100644
--- a/src/renderer/src/store/slices/ui.ts
+++ b/src/renderer/src/store/slices/ui.ts
@@ -770,7 +770,7 @@ export const createUISlice: StateCreator<AppState, [], [], UISlice> = (set, get)
       return { trustedOrcaHooks: next }
     }),
 
-  groupBy: 'repo',
+  groupBy: 'workspace-status',
   // Why: group keys are mode-specific (e.g. repo id vs PR status), so
   // collapsed state from one mode is meaningless in another. Clearing
   // also prevents unbounded accumulation of stale keys across mode switches.
diff --git a/src/shared/constants.ts b/src/shared/constants.ts
index a39fb4bbb..f7bc13c8a 100644
--- a/src/shared/constants.ts
+++ b/src/shared/constants.ts
@@ -338,7 +338,7 @@ export function getDefaultUIState(): PersistedUIState {
     lastActiveWorktreeId: null,
     sidebarWidth: 280,
     rightSidebarWidth: 350,
-    groupBy: 'repo',
+    groupBy: 'workspace-status',
     sortBy: 'recent',
     showActiveOnly: false,
     hideDefaultBranchWorkspace: false,