diff --git a/apps/web/src/components/Sidebar.logic.test.ts b/apps/web/src/components/Sidebar.logic.test.ts
index fcc0f50e8cb..2f5608a895a 100644
--- a/apps/web/src/components/Sidebar.logic.test.ts
+++ b/apps/web/src/components/Sidebar.logic.test.ts
@@ -21,7 +21,6 @@ import {
   getVisibleThreadsForProject,
   groupSidebarThreadsByWorktree,
   hasUnseenCompletion,
-  formatSidebarThreadDisplayTitle,
   isContextMenuPointerDown,
   isTrailingDoubleClick,
   orderItemsByPreferredIds,
@@ -1000,35 +999,46 @@ describe("resolveProjectTitleClassName", () => {
 });
 
 describe("resolveSidebarWorktreeLabelMode", () => {
-  it("inlines populated non-main worktrees in the native sidebar", () => {
+  it("shows a compact header for populated non-main worktrees in the native sidebar", () => {
     expect(
       resolveSidebarWorktreeLabelMode({
         enableNativeMacSidebar: true,
         isMainCheckout: false,
         threadGroupingMode: "worktree",
-        threadCount: 1,
+        worktreeGroupCount: 1,
       }),
-    ).toBe("inline");
+    ).toBe("header");
   });
 
-  it("hides the redundant main checkout label in the native sidebar", () => {
+  it("hides the redundant main checkout label when it is the only group", () => {
     expect(
       resolveSidebarWorktreeLabelMode({
         enableNativeMacSidebar: true,
         isMainCheckout: true,
         threadGroupingMode: "worktree",
-        threadCount: 0,
+        worktreeGroupCount: 1,
       }),
     ).toBe("hidden");
   });
 
+  it("shows the main checkout header alongside other worktree groups", () => {
+    expect(
+      resolveSidebarWorktreeLabelMode({
+        enableNativeMacSidebar: true,
+        isMainCheckout: true,
+        threadGroupingMode: "worktree",
+        worktreeGroupCount: 2,
+      }),
+    ).toBe("header");
+  });
+
   it("preserves upstream grouping when the native sidebar is disabled", () => {
     expect(
       resolveSidebarWorktreeLabelMode({
         enableNativeMacSidebar: false,
         isMainCheckout: true,
         threadGroupingMode: "worktree",
-        threadCount: 1,
+        worktreeGroupCount: 1,
       }),
     ).toBe("header");
   });
@@ -1039,7 +1049,7 @@ describe("resolveSidebarWorktreeLabelMode", () => {
         enableNativeMacSidebar: true,
         isMainCheckout: false,
         threadGroupingMode: "worktree",
-        threadCount: 0,
+        worktreeGroupCount: 1,
       }),
     ).toBe("header");
   });
@@ -1065,18 +1075,6 @@ describe("shouldShowSidebarEmptyThreadState", () => {
   });
 });
 
-describe("formatSidebarThreadDisplayTitle", () => {
-  it("combines the worktree and thread names", () => {
-    expect(formatSidebarThreadDisplayTitle("art-15915", "Use historic conversions")).toBe(
-      "art-15915: Use historic conversions",
-    );
-  });
-
-  it("keeps standalone thread titles unchanged", () => {
-    expect(formatSidebarThreadDisplayTitle(null, "General chat")).toBe("General chat");
-  });
-});
-
 describe("resolveProjectStatusIndicator", () => {
   it("returns null when no threads have a notable status", () => {
     expect(resolveProjectStatusIndicator([null, null])).toBeNull();
diff --git a/apps/web/src/components/Sidebar.logic.ts b/apps/web/src/components/Sidebar.logic.ts
index 5254ba582bf..fdd739fa7d9 100644
--- a/apps/web/src/components/Sidebar.logic.ts
+++ b/apps/web/src/components/Sidebar.logic.ts
@@ -513,11 +513,10 @@ export function resolveSidebarWorktreeLabelMode(input: {
   enableNativeMacSidebar: boolean;
   isMainCheckout: boolean;
   threadGroupingMode: "separate" | "worktree";
-  threadCount: number;
-}): "header" | "hidden" | "inline" {
+  worktreeGroupCount: number;
+}): "header" | "hidden" {
   if (!input.enableNativeMacSidebar || input.threadGroupingMode !== "worktree") return "header";
-  if (input.isMainCheckout) return "hidden";
-  return input.threadCount > 0 ? "inline" : "header";
+  return input.isMainCheckout && input.worktreeGroupCount === 1 ? "hidden" : "header";
 }
 
 export function shouldShowSidebarEmptyThreadState(input: {
@@ -527,13 +526,6 @@ export function shouldShowSidebarEmptyThreadState(input: {
   return input.showEmptyThreadState && !input.enableNativeMacSidebar;
 }
 
-export function formatSidebarThreadDisplayTitle(
-  worktreeLabel: string | null,
-  threadTitle: string,
-): string {
-  return worktreeLabel ? `${worktreeLabel}: ${threadTitle}` : threadTitle;
-}
-
 export function resolveThreadStatusPill(input: {
   thread: ThreadStatusInput;
 }): ThreadStatusPill | null {
diff --git a/apps/web/src/components/Sidebar.tsx b/apps/web/src/components/Sidebar.tsx
index 8bf3c13994f..fac9f6ed757 100644
--- a/apps/web/src/components/Sidebar.tsx
+++ b/apps/web/src/components/Sidebar.tsx
@@ -154,7 +154,6 @@ import { ProjectFavicon } from "./ProjectFavicon";
 import { openDiscoveredPort } from "./preview/openDiscoveredPort";
 import {
   getSidebarThreadIdsToPrewarm,
-  formatSidebarThreadDisplayTitle,
   isContextMenuPointerDown,
   isTrailingDoubleClick,
   orderItemsByPreferredIds,
@@ -347,8 +346,6 @@ function buildThreadJumpLabelMap(input: {
 interface SidebarThreadRowProps {
   thread: SidebarThreadSummary;
   nestedUnderWorktree: boolean;
-  worktreeLabel: string | null;
-  onWorktreeContextMenu?: (event: React.MouseEvent<HTMLSpanElement>) => void;
   projectCwd: string | null;
   orderedProjectThreadKeys: readonly string[];
   isActive: boolean;
@@ -411,8 +408,6 @@ export const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThr
     openPrLink,
     thread,
     nestedUnderWorktree,
-    worktreeLabel,
-    onWorktreeContextMenu,
   } = props;
   const threadRef = scopeThreadRef(thread.environmentId, thread.id);
   const threadKey = scopedThreadKey(threadRef);
@@ -512,7 +507,6 @@ export const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThr
     : !isThreadRunning
       ? "pointer-events-none transition-opacity duration-150 max-sm:pr-6 group-hover/menu-sub-item:opacity-0 group-focus-within/menu-sub-item:opacity-0"
       : "pointer-events-none";
-  const threadDisplayTitle = formatSidebarThreadDisplayTitle(worktreeLabel, thread.title);
   const clearConfirmingArchive = useCallback(() => {
     setConfirmingArchiveThreadKey((current) => (current === threadKey ? null : current));
   }, [setConfirmingArchiveThreadKey, threadKey]);
@@ -712,6 +706,7 @@ export const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThr
     <SidebarMenuSubItem
       className="w-full"
       data-thread-item
+      data-nested-under-worktree={nestedUnderWorktree}
       onMouseLeave={handleMouseLeave}
       onBlurCapture={handleBlurCapture}
     >
@@ -731,16 +726,7 @@ export const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThr
         onKeyDown={handleRowKeyDown}
         onContextMenu={handleRowContextMenu}
       >
-        <div
-          className={`native-sidebar-thread-content flex min-w-0 flex-1 items-center gap-1.5 text-left ${nestedUnderWorktree ? "pl-3" : ""}`}
-          data-nested-under-worktree={nestedUnderWorktree}
-        >
-          {worktreeLabel ? (
-            <GitBranchIcon
-              aria-hidden="true"
-              className="native-sidebar-inline-worktree-icon size-3.5 shrink-0"
-            />
-          ) : null}
+        <div className="native-sidebar-thread-content flex min-w-0 flex-1 items-center gap-1.5 text-left">
           {prStatus && (
             <Tooltip>
               <TooltipTrigger
@@ -778,23 +764,12 @@ export const SidebarThreadRow = memo(function SidebarThreadRow(props: SidebarThr
                     className="native-sidebar-thread-title min-w-0 flex-1 truncate text-[13px]"
                     data-testid={`thread-title-${thread.id}`}
                   >
-                    {worktreeLabel ? (
-                      <>
-                        <span
-                          className="native-sidebar-inline-worktree"
-                          onContextMenu={onWorktreeContextMenu}
-                        >
-                          {worktreeLabel}
-                        </span>
-                        <span className="native-sidebar-inline-worktree-separator">: </span>
-                      </>
-                    ) : null}
-                    <span className="native-sidebar-thread-title-segment">{thread.title}</span>
+                    {thread.title}
                   </span>
                 }
               />
               <TooltipPopup side="top" className="max-w-80 whitespace-normal leading-tight">
-                {threadDisplayTitle}
+                {thread.title}
               </TooltipPopup>
             </Tooltip>
           )}
@@ -1275,20 +1250,13 @@ const SidebarProjectThreadList = memo(function SidebarProjectThreadList(
     updateThreadMetadata,
   ]);
 
-  const renderThread = (
-    thread: SidebarThreadSummary,
-    nestedUnderWorktree = false,
-    worktreeLabel: string | null = null,
-    onWorktreeContextMenu?: (event: React.MouseEvent<HTMLSpanElement>) => void,
-  ) => {
+  const renderThread = (thread: SidebarThreadSummary, nestedUnderWorktree = false) => {
     const threadKey = scopedThreadKey(scopeThreadRef(thread.environmentId, thread.id));
     return (
       <SidebarThreadRow
         key={threadKey}
         thread={thread}
         nestedUnderWorktree={nestedUnderWorktree}
-        worktreeLabel={worktreeLabel}
-        {...(onWorktreeContextMenu ? { onWorktreeContextMenu } : {})}
         projectCwd={projectCwd}
         orderedProjectThreadKeys={orderedProjectThreadKeys}
         isActive={activeRouteThreadKey === threadKey}
@@ -1339,14 +1307,16 @@ const SidebarProjectThreadList = memo(function SidebarProjectThreadList(
         {shouldShowThreadPanel && threadGroupingMode === "worktree"
           ? renderedThreadGroups.flatMap((group) => {
               const label =
-                enableSidebarWorktreeNavigation || group.label !== "Main"
-                  ? group.label
-                  : "Main checkout";
+                enableNativeMacSidebar && group.isMainCheckout
+                  ? "Main checkout"
+                  : enableSidebarWorktreeNavigation || group.label !== "Main"
+                    ? group.label
+                    : "Main checkout";
               const worktreeLabelMode = resolveSidebarWorktreeLabelMode({
                 enableNativeMacSidebar,
                 isMainCheckout: group.isMainCheckout,
                 threadGroupingMode,
-                threadCount: group.threads.length,
+                worktreeGroupCount: renderedThreadGroups.length,
               });
               const labelContent = (
                 <>
@@ -1387,25 +1357,13 @@ const SidebarProjectThreadList = memo(function SidebarProjectThreadList(
                     )}
                   </SidebarMenuSubItem>
                 );
-              const handleInlineWorktreeContextMenu =
-                worktreeLabelMode === "inline"
-                  ? (event: React.MouseEvent<HTMLSpanElement>) => {
-                      event.preventDefault();
-                      event.stopPropagation();
-                      handleWorktreeGroupMenu(group, {
-                        x: event.clientX,
-                        y: event.clientY,
-                      });
-                    }
-                  : undefined;
               return [
                 ...(worktreeLabelRow ? [worktreeLabelRow] : []),
                 ...group.threads.map((thread) =>
                   renderThread(
                     thread,
-                    enableSidebarWorktreeNavigation && worktreeLabelMode === "header",
-                    worktreeLabelMode === "inline" ? label : null,
-                    handleInlineWorktreeContextMenu,
+                    worktreeLabelMode === "header" &&
+                      (enableNativeMacSidebar || enableSidebarWorktreeNavigation),
                   ),
                 ),
               ];
@@ -1781,7 +1739,6 @@ const SidebarStandaloneChatList = memo(function SidebarStandaloneChatList(
             key={threadKey}
             thread={thread}
             nestedUnderWorktree={false}
-            worktreeLabel={null}
             projectCwd={null}
             orderedProjectThreadKeys={orderedThreadKeys}
             isActive={props.activeRouteThreadKey === threadKey}
diff --git a/apps/web/src/index.css b/apps/web/src/index.css
index 98dadf86cc1..8b76cf42d08 100644
--- a/apps/web/src/index.css
+++ b/apps/web/src/index.css
@@ -494,13 +494,14 @@ body {
   margin-block: 2px;
 }
 
-.native-macos-sidebar .native-sidebar-thread-content[data-nested-under-worktree="true"] {
-  padding-left: 0;
+.native-macos-sidebar [data-thread-item][data-nested-under-worktree="true"] {
+  width: calc(100% - 12px);
+  margin-inline-start: 12px;
 }
 
 .native-macos-sidebar .native-sidebar-worktree-label {
   height: 30px;
-  margin-top: 4px;
+  margin-top: 6px;
   padding-inline: 10px;
   color: rgb(29 29 31 / 64%);
   font-size: 14px;
@@ -574,62 +575,6 @@ body {
   line-height: 20px;
 }
 
-.native-macos-sidebar .native-sidebar-inline-worktree-icon,
-.native-macos-sidebar .native-sidebar-inline-worktree {
-  color: rgb(29 29 31 / 56%);
-}
-
-.dark .native-macos-sidebar .native-sidebar-inline-worktree-icon,
-.dark .native-macos-sidebar .native-sidebar-inline-worktree {
-  color: rgb(255 255 255 / 44%);
-}
-
-.native-macos-sidebar .native-sidebar-inline-worktree {
-  font-weight: 500;
-}
-
-.native-macos-sidebar .native-sidebar-inline-worktree-separator {
-  color: rgb(29 29 31 / 48%);
-}
-
-.dark .native-macos-sidebar .native-sidebar-inline-worktree-separator {
-  color: rgb(255 255 255 / 32%);
-}
-
-.native-macos-sidebar .native-sidebar-inline-worktree ~ .native-sidebar-thread-title-segment {
-  color: rgb(29 29 31 / 80%);
-}
-
-.dark .native-macos-sidebar .native-sidebar-inline-worktree ~ .native-sidebar-thread-title-segment {
-  color: rgb(255 255 255 / 60%);
-}
-
-.native-macos-sidebar
-  .native-sidebar-thread-row[data-active="true"]
-  .native-sidebar-thread-title-segment {
-  color: #000000;
-}
-
-.dark
-  .native-macos-sidebar
-  .native-sidebar-thread-row[data-active="true"]
-  .native-sidebar-thread-title-segment {
-  color: #ffffff;
-}
-
-.native-macos-sidebar
-  .native-sidebar-thread-row[data-finished="true"]
-  .native-sidebar-thread-title-segment {
-  color: #1d1d1f;
-}
-
-.dark
-  .native-macos-sidebar
-  .native-sidebar-thread-row[data-finished="true"]
-  .native-sidebar-thread-title-segment {
-  color: #ffffff;
-}
-
 .native-macos-sidebar [data-thread-status-label] {
   width: 12px;
   height: 12px;
diff --git a/docs/personal-fork-changes.md b/docs/personal-fork-changes.md
index 15f136b8834..085cd1b2571 100644
--- a/docs/personal-fork-changes.md
+++ b/docs/personal-fork-changes.md
@@ -46,14 +46,15 @@ Turning a flag off preserves upstream behavior.
 - Light mode uses dark, regular-weight conversation text with progressively softer project and
   worktree context. Worktree labels use the same 14px size as thread titles instead of appearing
   disabled or undersized.
-- Populated worktrees use compact, branch-prefixed thread rows instead of separate group headers.
-  Conversation rows use a taller click target, and standalone worktree rows include a branch icon.
-  Worktree labels omit redundant thread counts. Empty worktrees remain standalone rows so they are
-  still available for new-chat and archive actions. Turning off the native sidebar flag restores
-  the upstream grouped layout and counts.
-- The native layout omits the generic "No threads yet" row and the redundant main-checkout label;
-  main-checkout threads render as plain conversation titles. Actionable worktree rows use a pointer
-  cursor. Turning the flag off restores those upstream labels.
+- Worktrees use compact branch headers with subtly inset conversation rows, keeping each checkout
+  visually distinct without repeating its branch on every thread. Worktree labels omit redundant
+  thread counts. Empty worktrees remain standalone rows so they are still available for new-chat
+  and archive actions. Turning off the native sidebar flag restores the upstream grouped layout
+  and counts.
+- The native layout omits the generic "No threads yet" row. It hides the redundant main-checkout
+  label when no other checkout is shown, but restores a "Main checkout" header when multiple
+  checkout groups need a visible boundary. Actionable worktree rows use a pointer cursor. Turning
+  the flag off restores upstream labels.
 - With sidebar worktree navigation enabled, worktree groups remain visible after their last thread
   is archived. Archiving the last thread requires confirmation and leaves the checkout and its Git
   registration intact. Worktree rows do not show inline archive buttons; every non-main worktree