Repro steps:
- Drag the Show Sidebar out of the Toolbar.
- It remains on the Toolbar.
Also occurs on a clean profile.
On previous versions, we were able to remove it from the toolbar.
Version 1.0.5 (144.1-rc), WebKit 619.1.11.111.2 Build date April 10, 2026,
Version 1.0.6 (145.1-rc), WebKit 619.1.11.111.2 Build date April 14, 2026
Mojave (10.14)
Edit: updated title since this also occurs beyond macOS 10.14
