[BUG] Navigation bar rendering in desktop app obscures main claude code window

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?

In desktop app when using claude code, the left side navigation bar renders a large blank area to the right of the navigation bar that obscures the active claude code window. To use claude code window I need to collapse the navigation bar. This has been an issue on the last couple updates but wasn't a problem I had previously.

<img width="582" height="495" alt="Image" src="https://github.com/user-attachments/assets/c14abfd5-ffef-4e1b-973e-f5025d690f1e" />

What Should Happen?

The side navigation bar should open and allow switching of sessions without blocking the main claude code window.

Error Messages/Logs

Steps to Reproduce

1. Start claude code session.
2. Have side navigation menu open, click on session in menu bar to select session

Claude Model

Not sure / Multiple models

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

iTerm2

Additional Information

_No response_