### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet - [x] This is a single bug report (please file separate reports for different bugs) - [x] I am using the latest version of Claude Code ### What's Wrong? On the Windows desktop app, opening a chat in a separate window (New Window / pop-out) produces a window with no title bar: no top strip to drag/move the

[BUG] [Desktop/Windows] Chat opened in a New Window (pop-out) has no title bar - can't drag or resize; regression after MSIX update to 1.25927.0

Status Fixed / completed

Maintainer reply None cached

Workaround ✓ Mentioned in description ↑

Activity 0 comments · opened Aug 6, 2026 · closed Aug 7, 2026

Preflight Checklist

[x] I have searched existing issues and this hasn't been reported yet
[x] This is a single bug report (please file separate reports for different bugs)
[x] I am using the latest version of Claude Code

What's Wrong?

On the Windows desktop app, opening a chat in a separate window (New Window / pop-out) produces a window with no title bar: no top strip to drag/move the window, no resize bar, and no minimize/maximize/close controls. The main app window is unaffected and keeps its normal title bar.

This started after an auto-update. Pop-out windows had a normal title bar on the previous version and lost it on the current one.

What Should Happen?

The pop-out window has the same title bar as the main window (drag region + minimize/maximize/close), so it can be moved and resized.

Error Messages/Logs

No error is thrown when the pop-out is created. The only title-bar-related log line is:
  "Failed to set title bar overlay, this is probably expected"  (%APPDATA%\Claude\logs\main.log)
— but it appears constantly on BOTH the last-good version (1.24012.11) and the broken one (1.25927.0), so it looks benign / not the cause.

Steps to Reproduce

On Windows 11, open Claude Desktop (Microsoft Store / MSIX), version 1.25927.0.
Open a chat in its own window via right-click, new window.
The new window opens with no title bar — no drag strip, no minimize/maximize/close, can't be moved or resized normally.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

1.24012.11

Claude Code Version

Claude Desktop 1.25927.0 (Windows MSIX) - Desktop app, not the CLI

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

This is the Claude Desktop app (Windows 11, Microsoft Store / MSIX), not the Claude Code CLI — filing here since other desktop issues use the area:desktop label. The Claude Code Version / Platform / Terminal fields above aren't applicable; the relevant build is Claude Desktop 1.25927.0.

Timeline: the app auto-updated 1.24012.11 -> 1.25927.0 on ~2026-08-05; the missing title bar was noticed the next day. The main window is unaffected throughout.

Workarounds: Alt+Space -> M / S (Windows keyboard move/resize) works. Ctrl+R (reload the pop-out) does NOT restore the title bar.

Likely cause (from inspecting the app bundle): the main window is created with titleBarStyle:'hidden' + titleBarOverlay:true set directly, so it always has a title bar. Pop-out / new windows are created through the internal WindowManager, whose defaultWindowOptions provides only backgroundColor + webPreferences — no frame / titleBarStyle / titleBarOverlay. So the pop-out comes up frameless. Looks like a regression in the 1.25927.0 window-creation path: the pop-out no longer gets the hidden-titlebar + overlay treatment the main window gets.

Screenshots: main window (with title bar) vs. pop-out (no title bar).

View original on GitHub ↗