[Cowork desktop – Mac Intel] Chat area text clipped by left sidebar

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?

App: Claude Cowork (desktop, native Mac app)
macOS: Mac Intel
Date observed: April 21, 2026

Description:
The main chat/conversation area is visually clipped on its left side. The left sidebar (with navigation items like "New task", "Projects", etc.) overlaps the content column instead of pushing it to the right. As a result, the beginning of each line in the chat is hidden behind the sidebar.

Steps to reproduce:

1. Open the Cowork desktop app on a Mac Intel machine
2. Open any conversation
3. Observe that the chat text is truncated on the left side — the first letters of each line are hidden behind the sidebar

Expected behavior:
The sidebar and the chat area should be properly separated, with no overlap. All text in the chat should be fully visible.

Actual behavior:
The sidebar renders on top of the content area rather than beside it, cutting off the beginning of each line of text in the chat.

Additional context:
Screenshot attached showing the issue clearly.

<img width="1105" height="726" alt="Image" src="https://github.com/user-attachments/assets/f31adac0-861f-49dc-96f5-13d9bea39711" />

What Should Happen?

Sidebar (ghost) should not cover text

Error Messages/Logs

Steps to Reproduce

1. Open the Cowork desktop app on a Mac Intel machine
2. Open any conversation
3. Observe that the chat text is truncated on the left side — the first letters of each line are hidden behind the sidebar

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

N/A – This bug is in the Cowork desktop app (Mac Intel), not Claude Code CLI

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_