### Summary On Windows, a session opened in a separate (detached) window cannot be maximized or made fullscreen. The main app window maximizes normally — only detached session windows are affected. ### Environment - Claude Desktop 1.25927.0 (Aug 4, 2026 build) - Windows 11 Pro, 10.0.26200 ### Steps to reproduce 1. Open Claude Desktop with a few sessions. 2. Open one session in a new window ("open in new window"). 3. Try to maximize that window: click the maximize button, double-click the ti

Detached session window cannot be maximized or fullscreened (Windows)

Status Fixed / completed

Maintainer reply None cached

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

Summary

On Windows, a session opened in a separate (detached) window cannot be maximized or made fullscreen. The main app window maximizes normally — only detached session windows are affected.

Environment

Claude Desktop 1.25927.0 (Aug 4, 2026 build)
Windows 11 Pro, 10.0.26200

Steps to reproduce

Open Claude Desktop with a few sessions.
Open one session in a new window ("open in new window").
Try to maximize that window: click the maximize button, double-click the title bar, or press <kbd>Win</kbd>+<kbd>Up</kbd>.

Expected

The detached window maximizes to fill the screen, like the main window does.

Actual

Nothing happens. The window stays at its default floating size and can only be resized by dragging its edges. None of the three ways to maximize work (maximize button, title-bar double-click, Win+Up snap).

Impact

Working with several sessions side by side means the detached one is stuck small, so long output and diffs are hard to read.

Note

The Aug 4 release notes mention changes to window restore behavior ("a window the system shut down under low memory reloads instead of staying blank"), so this may be a regression from that area — the detached window may be created without the maximizable window flag.

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