[BUG] UI Issue on Mac laptop

Preflight Checklist

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

What's Wrong?

<img width="922" height="1540" alt="Image" src="https://github.com/user-attachments/assets/eab61aa0-2391-421e-95a4-9dad34792221" />
<img width="436" height="1558" alt="Image" src="https://github.com/user-attachments/assets/0bb6ba97-604b-44e4-ba8e-397b5a455482" />
<img width="792" height="1532" alt="Image" src="https://github.com/user-attachments/assets/5a5cbe34-7926-42a0-8cdf-d15edbb63c30" />
<img width="632" height="1498" alt="Image" src="https://github.com/user-attachments/assets/d65f0653-9345-413f-ac02-631c1cc89e72" />

I am getting this weird white mask issue when I use Claude Desktop on my macOS. When I open the collapse sidebar, I see this white area that cuts the main claude type space for me. When i collapse it, it goes off. I like to keep the collapse sidebar open usually. trying to understand if its an issue i am facing or others too. And how to fix it. I have tried the general recommended forcwe quit, reinstall and termial prompt but nothing is working.

<img width="480" height="452" alt="Image" src="https://github.com/user-attachments/assets/eb5dfe12-301e-47c3-a6de-91af02b809ad" />

What Should Happen?

The sidebar should open and close seamlessly shifting the window to one side like normal sidebar functions.

Error Messages/Logs

Steps to Reproduce

i installed claude to my laptop
opened it to use
opened the side bar to see my latest projects, chats, etc.
noticed the issue

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.2581.0 (f10398) 2026-04-14T17:16:40.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_