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claude-code - 💡(How to fix) Fix [BUG] Blank space on the left of conversations in Claude Mac Desktop app

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Error Message

Error Messages/Logs

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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Hello Anthropic team,

I'm experiencing a visual bug on the Claude desktop app for macOS.

Issue: A white horizontal band appears across the middle of the interface, but only when a conversation is open. The app displays correctly on the home screen and in Settings. If I put the app in full screen mode it's okay, but if not in full screen it's like the white space on the left of the conversations just doesn't resize and have an bigger z-index than the text.

Environment:

  • macOS, Retina display
  • Latest version of Claude desktop app (freshly reinstalled)

What I've already tried:

  • Restarting the app
  • Resizing the window
  • Clearing the cache (~/Library/Application Support/Claude/Cache)
  • Full uninstall and reinstall

None of these resolved the issue. The band is fixed (doesn't move with scroll) and appears consistently on every conversation opened.

I've attached a screenshot for reference.

Please let me know if you need additional information (logs, app version, macOS version).

What Should Happen?

normal display

<img width="709" height="488" alt="Image" src="https://github.com/user-attachments/assets/952f29ba-7838-4ca9-a9db-c1b09f9644d3" />

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

  1. Open Claude desktop app → displays correctly
  2. Open any conversation → white horizontal band appears across the interface

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude 1.3109.0 (35cbf6)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The issue can likely be resolved by investigating and adjusting the CSS or layout settings in the Claude desktop app to properly handle window resizing and conversation display.

Guidance

  • Verify that the issue is specific to the conversation view by testing different conversation types and window sizes to see if the white band appears consistently.
  • Check the app's CSS or layout configuration to ensure that the conversation container is properly resizing and that there are no overlapping elements with a higher z-index.
  • Test the app in different macOS display settings, such as changing the scaling or resolution, to see if the issue is related to the Retina display.
  • Consider providing more information about the previous version that worked correctly, such as the version number, to help identify the regression cause.

Example

No code snippet is provided as the issue is related to a visual bug and requires more information about the app's internal implementation.

Notes

The issue seems to be related to a regression in the app's layout or display handling, and resolving it may require adjustments to the app's internal code or configuration. The provided information is limited, and more details about the app's implementation and previous working version may be necessary to identify the root cause.

Recommendation

Apply workaround: The user can try using the app in full-screen mode as a temporary workaround until the issue is resolved.

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