Studio plugin toolbar button disappeared after UI update

Issue
An installed plugin still appears in management but its toolbar button is gone.

Cause
The toolbar may be hidden, crowded, reset, or incompatible with the current Studio UI preview.

Fix
Update the plugin, inspect plugin and toolbar menus, and reset only the toolbar layout before reinstalling. Disable duplicate versions of the same plugin. Plugin authors should create toolbar controls through supported APIs and avoid assumptions about fixed screen position.

Verify
Enable the plugin in a blank place, restart Studio, and confirm the button appears and opens one window.

Official Roblox next-generation Studio UI preview