Claude Desktop sidebar cannot be pinned open — toggle-only flyout in new build

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 the current Claude Desktop build, the sidebar (session list / navigation panel) can only be toggled open or closed via the hamburger/lines icon in the upper-left corner of the window. Once toggled open, it appears as a flyout overlay and closes again when focus moves away. There is no option to pin or dock it open so it remains persistently visible alongside the main conversation pane.

In previous builds, the sidebar could be kept open as a fixed panel. That behavior is gone. The toggle icon is the only control available; no pin, dock, or "keep open" affordance exists in the UI or any menu.

What Should Happen?

The sidebar should be pinnable/dockable so it stays persistently open alongside the main conversation pane, as it did in previous builds. A pin icon or equivalent control should allow users to lock the sidebar open rather than having it behave only as a temporary flyout overlay.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Desktop
2. 2. Observe the sidebar is collapsed by default
3. 3. Click the hamburger/lines icon in the upper-left corner to open the sidebar
4. 4. Observe the sidebar appears as a flyout overlay on top of the conversation pane
5. 5. Click anywhere in the main conversation area
6. 6. Observe the sidebar closes automatically
7. 7. Look for any pin, dock, or "keep open" control — none exists

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.114 (Claude Code)

Platform

Other

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

This is a Claude Desktop UI issue — not a CLI or API bug. Platform field above doesn't have a "Claude Desktop" option, so "Other" was selected.

The sidebar was previously dockable/pinnable as a persistent panel. In the current build it behaves only as a temporary flyout that closes on any click outside it. No pin/dock affordance exists anywhere in the UI or menus.