claude-code - 💡(How to fix) Fix [BUG] Cowork left sidebar completely missing — no Settings, navigation, or Feedback buttons visible

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Error Message

Error Messages/Logs

RAW_BUFFERClick to expand / collapse

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?

The entire left sidebar in Cowork is missing/collapsed and cannot be reopened. This sidebar contains critical UI elements including Settings, navigation between modes (Chat/Code/Cowork), and the Feedback button — none of which are accessible. The X button at the top left appears to be stuck together with the collapsed sidebar and is also non-functional. As a result, it is impossible to:

Access Settings Navigate between app modes Use the Feedback button to report the issue from within the app

Restarting the application does not resolve the issue.

<img width="1462" height="1010" alt="Image" src="https://github.com/user-attachments/assets/21499650-a7ff-4ac1-baef-e03040c36690" />

What Should Happen?

The left sidebar should be fully visible and functional, displaying all navigation options including Settings, mode switching (Chat / Code / Cowork), and the Feedback button. The X button should work independently and not be tied to the sidebar state.

Error Messages/Logs

Steps to Reproduce

Steps to Reproduce:

Open Claude Desktop app Navigate to Cowork mode Observe that the left sidebar is collapsed and cannot be expanded Attempt to click the X button — it is unresponsive No Settings, navigation, or Feedback button are accessible

Claude Model

Not sure / Multiple models

Is this a regression?

I don't know

Last Working Version

No response

Claude Code Version

cant find, part of the problem

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

No response

extent analysis

TL;DR

The issue can be potentially resolved by investigating and fixing the CSS or layout issues that are causing the left sidebar to collapse and the X button to become unresponsive.

Guidance

  • Investigate the CSS styles applied to the left sidebar and the X button to identify any potential conflicts or overrides that could be causing the issue.
  • Check the JavaScript code that handles the toggle functionality of the sidebar to ensure it is working correctly and not interfering with the X button's functionality.
  • Verify that there are no duplicate or conflicting IDs or classes in the HTML structure that could be causing the layout issues.
  • Test the application in different browsers or environments to see if the issue is specific to the current setup.

Example

No code example can be provided without more information about the specific implementation, but checking the CSS and JavaScript code for any potential issues or conflicts is a good starting point.

Notes

The issue seems to be related to the layout and styling of the application, but without more information about the code or the specific technologies used, it's difficult to provide a more specific solution. The fact that restarting the application does not resolve the issue suggests that it's not a temporary or caching-related problem.

Recommendation

Apply workaround: Since the issue is likely related to the layout and styling, trying to apply a workaround by adjusting the CSS styles or JavaScript code to fix the layout issues and make the X button responsive again could be a good approach.

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claude-code - 💡(How to fix) Fix [BUG] Cowork left sidebar completely missing — no Settings, navigation, or Feedback buttons visible