[BUG] white vertical stripe hides left edge of text when right-side panel is pinned (Claude Desktop, macOS)

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?

Bug: white vertical stripe hides left edge of text when right-side panel is pinned (Claude Desktop, macOS)
When I pin the right-side panel (Progress / Working folders / Context) in Claude Desktop, a blank white vertical stripe appears between the left navigation sidebar and the chat area. It's empty — no content — and it overlaps the first several characters of every line of chat text, making the conversation hard to read.
Steps: open a conversation with a lot of text → click the pin icon in the top right to pin the right-side panel → the white stripe appears, clipping the left edge of each line.
Expected: pinning the panel should shrink the chat from the right, with no overlay or clipping on the left.
It goes away as soon as I unpin the panel. macOS, observed 17 April 2026. Screenshot attached.

What Should Happen?

Expected: pinning the panel should shrink the chat from the right, with no overlay or clipping on the left.
It goes away as soon as I unpin the panel. macOS, observed 17 April 2026. Screenshot attached.

Error Messages/Logs

Steps to Reproduce

Steps: open a conversation with a lot of text → click the pin icon in the top right to pin the right-side panel → the white stripe appears, clipping the left edge of each line.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Claude 1.3109.0 (35cbf6) 2026-04-16T20:32:01.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="1920" height="1080" alt="Image" src="https://github.com/user-attachments/assets/cd5da6be-1083-40d6-a56d-b86ae315cf44" />