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Codex Issues / #25154

Codex Desktop App Windows Full Screen Issue

Open 💬 9 comments Opened May 29, 2026 by JustinDouglas16
💡 Likely answer: A maintainer (github-actions[bot], contributor) responded on this thread — see the highlighted reply below.

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

26.527.30818

What subscription do you have?

Free

What platform is your computer?

Microsoft Windows NT 10.0.19045.0 x64

What issue are you seeing?

<img width="978" height="809" alt="Image" src="https://github.com/user-attachments/assets/5ee4c1d6-6f2c-44b9-9e74-a8cb35a258ff" />

When trying to go full screen wether it's own my laptop screen or monitor i get this weird issue after i just updated to the new version.
When it's in focus the sidebar is and the top part are transparent but when its not focused you do see the correct color for them

What steps can reproduce the bug?

Step 1: Go to microsoft store and update Codex app
Step 2: Open Codex app
Step 3: Click on the full screen button
Step 4: Go focus on another app any app will do and you will see Codex app shows correctly (no transparent sidebar and top)
Step 5: Click/Focus on Codex app again and it becomes transparent for the sidebar and top

What is the expected behavior?

Expected behaviour: should take up full screen with the color for sidebar and top part.

Additional information

_No response_

View original on GitHub ↗

9 Comments

github-actions[bot] contributor · 1 month ago

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

  • #25148
  • #24904

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trpultz · 1 month ago

I was just about to submit this issue as well. I am on the Pro plan, same Windows version, and Codex version.

cesargagneux-hub · 1 month ago

Same here

JustinDouglas16 · 1 month ago

There is a fix and it works for me. There seems to be an issue with the translucent sidebar. Toggle this setting off.. Also seems to be a new update in codex so maybe also update that.

Previous version was: 26.527.30818
Now: 26.527.31326

<img width="1768" height="923" alt="Image" src="https://github.com/user-attachments/assets/34177078-34c4-4553-beb5-a2500bd3c8d4" />

wxh-cyber · 1 month ago

Thanks.I have solved this problem.

trpultz · 1 month ago

Solved my problem as well. Thanks Justin! I never would've guessed that there was a new appearance setting that would've just toggled itself on.

ShuoruiZhang · 1 month ago

what a stupid default setting

JustinDouglas16 · 1 month ago

agreed!

today080221 · 1 month ago

Adding a focused/unfocused repaint data point that seems related to this issue. No screenshots attached because the captures include personal UI content.

Environment:

  • Codex Desktop package: OpenAI.Codex_26.609.9530.0_x64__2p2nqsd0c76g0
  • Codex.exe ProductVersion/FileVersion: 149.0.7827.54
  • OS: Windows 11 Pro for Workstations, 10.0.26200 Build 26200
  • Three 2560x1440 monitors at 100% scaling
  • Windows transparency effects enabled
  • DWM attributes on the Codex main window: SystemBackdropType=2, UseImmersiveDarkMode=1, WindowCornerPreference=2

Observed:

  • When switching Codex from focused to unfocused, the app chrome/sidebar/top menu visibly flashes/repaints. The main chat/content area stays visually stable.
  • Pixel sampling from focused vs unfocused captures showed the content background unchanged at about RGB 17,17,17.
  • The sidebar/topbar changed substantially between focus states:
  • sidebar: about RGB 23,23,23 unfocused vs RGB 41,41,41 focused
  • topbar: about RGB 25,29,32 unfocused vs RGB 42,46,49 focused

This looks like the active/inactive Mica or translucent-sidebar layer repainting differently on focus changes. I am also seeing the adjacent-monitor spillover tracked in #25826; I added exact Win32/DWM bounds there: https://github.com/openai/codex/issues/25826#issuecomment-4723996622