Skip to content

Codex Desktop App Windows Full Screen Issue #25154

Open

Description

@JustinDouglas16

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?

Image

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

Activity

  1. added
    bugSomething isn't working
    windows-osIssues related to Codex on Windows systems
    on May 29, 2026
  2. github-actions commented on May 29, 2026

    @github-actions
    Contributor

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

    Powered by Codex Action

  3. trpultz commented on May 29, 2026

    @trpultz

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

  4. cesargagneux-hub commented on May 30, 2026

    @cesargagneux-hub

    Same here

  5. JustinDouglas16 commented on May 30, 2026

    @JustinDouglas16
    Author

    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

    Image
  6. wxh-cyber commented on May 30, 2026

    @wxh-cyber

    Thanks.I have solved this problem.

  7. trpultz commented on May 30, 2026

    @trpultz

    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.

  8. ShuoruiZhang commented on Jun 3, 2026

    @ShuoruiZhang

    what a stupid default setting

  9. JustinDouglas16 commented on Jun 3, 2026

    @JustinDouglas16
    Author

    agreed!

  10. today080221 commented on Jun 16, 2026

    @today080221

    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: #25826 (comment)

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment

Metadata

Metadata

Assignees

No one assigned

    Labels

    appIssues related to the Codex desktop appbugSomething isn't workingwindows-osIssues related to Codex on Windows systems

    Type

    No type

    Projects

    No projects

      Milestone

      No milestone

      Relationships

      None yet

      Development

      No branches or pull requests

      Issue actions