claude-code - 💡(How to fix) Fix [BUG] Claude Desktop sidebar rendering bug - white/black overlay blocks content on macOS [1 participants]

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anthropics/claude-code#52108Fetched 2026-04-23 07:36:23
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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?

A white/black overlay block appears on the left sidebar of Claude Desktop. The block is white during day mode and black during night mode (following system theme). When I resize the sidebar, the block extends with it. This blocks significant content on the left side and affects usability.

What Should Happen?

The sidebar should display normally without any overlay blocks. All interface content should be fully visible and accessible. When resizing the sidebar, no white or black blocks should appear.

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce: Open Claude Desktop on macOS Sequoia 15.7.3 Observe the left sidebar - a white block (in day mode) or black block (in night mode) appears overlaying content Try resizing the sidebar by dragging its edge Notice the overlay block extends/moves with the sidebar resize Switch between light and dark system appearance modes Observe the block changes from white to black accordingly Additional context: Issue persists after uninstalling/reinstalling the app Issue persists after restarting computer Issue persists after clearing cache and resetting app data MacBook Pro 13-inch 2020, Intel Iris Plus Graphics 645, 8GB RAM

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude 1.3883.0 (93ff6c) 2026-04-21T17:24:01.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The issue can be potentially resolved by investigating and fixing the CSS styling or layout management in the Claude Desktop application, specifically related to the left sidebar and system theme integration.

Guidance

  • Review the application's CSS files to identify any styling issues that could cause the overlay block to appear, focusing on classes related to the left sidebar and theme modes.
  • Investigate the JavaScript code responsible for handling sidebar resizing and theme changes to ensure it correctly updates the layout and styling.
  • Check for any recent changes in the application's codebase that could have introduced this regression, comparing the current version (Claude 1.3883.0) with previous versions where the issue was not present.
  • Consider testing the application on different macOS versions and hardware configurations to determine if the issue is specific to macOS Sequoia 15.7.3 or the MacBook Pro 13-inch 2020 model.

Example

No specific code example can be provided without access to the application's codebase, but the investigation should focus on CSS classes and JavaScript functions related to sidebar management and theme integration.

Notes

The issue's persistence across different system states (e.g., after uninstalling/reinstalling the app, restarting the computer, clearing cache, and resetting app data) suggests a potential problem with the application's code rather than a user-specific configuration issue. Without knowing the last working version, it's challenging to pinpoint the exact change that introduced the regression.

Recommendation

Apply a workaround by potentially adjusting the application's CSS styling manually (if possible) or waiting for an official update that addresses this regression, as the issue seems to be related to the application's code and its interaction with system themes.

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claude-code - 💡(How to fix) Fix [BUG] Claude Desktop sidebar rendering bug - white/black overlay blocks content on macOS [1 participants]