[BUG] Claude Desktop hides left part of the conversation;.

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="2125" height="1485" alt="Image" src="https://github.com/user-attachments/assets/16dd415f-fd11-4df5-9503-e9cecb1b0ff1" />

The left part of the conversation part always disappears on Claude Desktop. No matter it is Chat, CoWork, or Code. I'm using Mac. I've tried the following:

• maximize the window
• hide the left panel
• made sure everything is up-to-date including re-running the "check for update"
• force quit and restart
• clear cache and reset Apps Data
• restart my computer
• reinstall claude Desktop

Sometimes it will start with normal, for example, after reinstall. But immediately after the first or second input, it goes back into this status. There is no error in Console.app. I've already tried the AI assistant and exhausted its suggestions, and it tell me to file a bug report.

What Should Happen?

Full panel and input box should be shown, no matter the left panel is hidden or not.

Error Messages/Logs

Steps to Reproduce

Open Claude Desktop and if it is not showing immediately, click into "projects", or start chat.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

Version 1.3109.0 (35cbf6)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_