Explore using a tree icon for toggling the file tree

[alexdima]

• currently we're using an icon that looks like a list
• it might be more fitting to use a tree icon

Version: 1.137.0-insider
Commit: 023b8803f23ea6451959d09a05c4e2ff90fedc34
Date: 2026-09-08T00:36:40Z
Electron: 42.10.0
ElectronBuildId: 15109253
Chromium: 148.0.7778.280
Node.js: 24.18.1
V8: 14.8.178.38-electron.0
@github/copilot: 1.0.84-canary.70.gdb75d0d.unsigned
@github/copilot-sdk: 1.0.13-preview.4
OS: Darwin arm64 25.6.0

[sandy081]

A tree icon might be confusing here because it could suggest toggling between list and tree views. I agree that the current icon can be improved, though. I’ll get UX help to identify a better icon for this action.