Windows desktop app maximized window leaves transparent/offset area on the left

Summary

On the Codex Windows desktop app, maximizing the window causes the app content/webview to be horizontally offset instead of filling the full window. The left side of the maximized window remains transparent and shows the Windows desktop behind it.

Environment

• Product: Codex desktop app
• OS: Windows desktop
• Display scaling: 100%
• Monitors: Reproduces on multiple monitors
• Locale/input: Korean locale/input in the observed session
• App version: Unknown from UI

Steps to reproduce

1. Launch Codex desktop app on Windows.
2. Open any thread.
3. Maximize the app window using the maximize button.
4. Observe the left side of the maximized window.

Expected behavior

The Codex app content should fill the entire maximized window. No part of the Windows desktop should be visible through the app window.

Actual behavior

The app appears maximized, but the main white app content starts roughly 300px from the left edge. The area to the left remains transparent and shows the Windows desktop/icons/wallpaper behind the app. This happens at 100% display scaling and on more than one monitor.

Notes

• Manually resizing the window instead of maximizing appears to be a workaround.
• Other desktop apps on the same machine, including Claude, maximize normally, so this appears specific to the Codex desktop app's Windows maximize/layout handling.
• The issue looks like the native window bounds and the internal webview/content bounds are getting out of sync when maximized.