Unity Issue Tracker - UI Builder adds non-removable built-in class selectors when adding a custom selector via “Add Selector...”

Active

Under Consideration for 6000.5.X

Votes

Found in

Issue ID

Regression

UI Builder adds non-removable built-in class selectors when adding a custom selector via “Add Selector...”

-

Feb 09, 2026

Steps to reproduce:

Create a new project using Universal 3D template
Go to Assets > Create > UI Toolkit > UI Document (UXML)
Open the created UI Document in UI Builder
Add any element to Hierarchy, e.g. "Toggle"
Right-click on it and select "Add Selector..."
In the selector field, type in any name (e.g. ".test") and click enter
Click on the previously created element ("Toggle") and observe its Style Class List in Inspector

Actual results: "Toggle" elements has ".unity-toggle" selector in the Style Class List and it is not removable

Expected results: "Toggle" elements has ".test" selector in the Style Class List and it is removable

Reproducible with versions: 6000.0.66f1, 6000.3.8f1, 6000.4.0b8, 6000.5.0a6

Tested on (OS): Ubuntu 24.04, Windows 11

Note:

Reproduces across multiple UI Toolkit controls, not limited to Toggle
The built-in class appears to override or replace the custom selector added via “Add Selector...” and cannot be removed from the Style Class List