Codex Desktop trespassing next monitor screen

Open 💬 2 comments Opened Jun 26, 2026 by renandecarlo

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

26.623.31921

What subscription do you have?

Pro

What platform is your computer?

Microsoft Windows NT 10.0.26200.0 x64

What issue are you seeing?

Codex Desktop on Windows uses width >100% in when maximized, trespassing around 10-15px of the next monitor screen.

Behavior:
<img width="450" height="184" alt="Image" src="https://github.com/user-attachments/assets/adbf0ee9-dc51-4f01-a1af-8dd23e5848ce" />

Expected:
<img width="465" height="229" alt="Image" src="https://github.com/user-attachments/assets/a6865b85-f5b3-49ad-8be8-7fa2f1fb0e45" />

What steps can reproduce the bug?

Open Codex on Windows, on a 2+ screen PC
Maximize Codex

What is the expected behavior?

_No response_

Additional information

_No response_

View original on GitHub ↗

2 Comments

Fujino-Tatsuya · 1 month ago

I can reproduce this on Codex Desktop 26.623.9142.0.

Both monitors are set to 100% scaling, and the issue occurs regardless of which monitor the window is maximized on.

One additional observation: the overlapped area is actually rendered (it appears in screenshots), but clicking it causes the window to briefly flash and lose focus.

I've attached a short screen recording demonstrating the issue.

https://github.com/user-attachments/assets/7e4052f4-569e-4fc8-9bf8-12a5b8779298

Stershen · 1 month ago

I can reproduce the same issue on Codex App version 26.721.41059.

Platform:
Microsoft Windows NT 10.0.26100.0 x64

Display configuration:

Primary display: 4096 × 2160, 225% scaling, landscape orientation.
Secondary display: 1080 × 1920, 150% scaling, portrait orientation.
The secondary display is positioned to the right of the primary display.

When Codex is maximized on the primary display using the standard Windows maximize button, approximately 10–12 pixels of the Codex window extend onto the secondary monitor and overlap any application displayed there.

The issue does not occur when the Codex window is restored and manually resized to almost fill the primary display. Other Windows applications maximize correctly with the same display configuration.