[BUG]

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?

Title: macOS UI bug: left sidebar overlaps main chat text at any window size

Description:
On Claude Desktop for macOS, the left sidebar overlaps the main chat text, making the UI hard to read. This happens even when resizing the window, and it persists after reinstalling the app.

Steps to reproduce:
1) Open Claude Desktop on macOS
2) Resize the window to any size
3) Observe the sidebar overlapping the chat text

Environment:

• Claude Desktop version: 1.2581.0 (f10398) 2026-04-14T17:16:40.000Z
• macOS version: 15.3.1 (a) (25D771280a)

Attachments:

• Screenshot showing the overlap (attached)

Logs:

• macOS Console.app logs (attached)

<img width="1611" height="924" alt="Image" src="https://github.com/user-attachments/assets/24092a8c-a950-4ab2-80d3-477f67884162" />

What Should Happen?

it should not overlap

Error Messages/Logs

Steps to Reproduce

Open Claude Desktop on macOS.
Resize the window to any size (small, medium, large).
Observe that the left sidebar overlaps the main chat text, making it hard to read.
Confirm it still happens after reinstalling the app.

Claude Model

None

Is this a regression?

I don't know

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_