Fullscreen triggers abnormal transparent background on Codex App

What version of the Codex App are you using (From “About Codex” dialog)?

Latest Version

What subscription do you have?

Free tier

What platform is your computer?

window 10

What issue are you seeing?

After clicking fullscreen on Codex App, the app background turns transparent and desktop content is visible underneath with broken UI layering.

What steps can reproduce the bug?

1. Open Codex App normally.
2. Click the fullscreen button to enter full-screen mode.
3. The app background turns fully transparent and desktop content shows through the window.
4. After exiting fullscreen, the background returns to normal opaque state.

Bug description: When switching to fullscreen mode, UI background loses opacity and becomes transparent, desktop is visible beneath application window. No code snippet needed for this display rendering issue.

What is the expected behavior?

_No response_

Additional information

_No response_