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Codex Desktop App Windows Full Screen Issue #25154
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?
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.
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
Reacted by gpullen, Emir Kurtović, Trevor, Ziga Berce, Marcio, Ryan, znbsfLY, duckIing, Yihao, Murpho and 10 more
Reacted by biohazardous-man, gpullen, Trevor, TeamDman, Marcio, Hocho, Jacob Hawkins, Liou YouCheng, Jonas Meyer, KingPan and 6 more
Adding a focused/unfocused repaint data point that seems related to this issue. No screenshots attached because the captures include personal UI content.
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: #25826 (comment)
Activity
github-actions commentedon May 29, 2026
Potential duplicates detected. Please review them and close your issue if it is a duplicate.
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trpultz commentedon May 29, 2026
I was just about to submit this issue as well. I am on the Pro plan, same Windows version, and Codex version.
cesargagneux-hub commentedon May 30, 2026
Same here
JustinDouglas16 commentedon May 30, 2026
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
wxh-cyber commentedon May 30, 2026
Thanks.I have solved this problem.
trpultz commentedon May 30, 2026
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 commentedon Jun 3, 2026
what a stupid default setting
JustinDouglas16 commentedon Jun 3, 2026
agreed!
today080221 commentedon Jun 16, 2026
Adding a focused/unfocused repaint data point that seems related to this issue. No screenshots attached because the captures include personal UI content.
Environment:
Observed:
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: #25826 (comment)