Disabling Curved UI leaves the Curvature options visible and editable until a different element is selected

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Open the Project Settings window (Edit > Project Settings)
3. Open the UI Toolkit tab in the Project Settings and enable Curved UI
4. Create a new UI Document (Assets > Create > UI Toolkit > UI Document (UXML))
5. Double click the UI Document in Project window to open it in UI Builder
6. Add an element to the Hierarchy
7. Select the element in the Hierarchy
8. Open the "Transform" foldout
9. Disable Curved UI in the Project Settings
10. Observe the "Transform" foldout in the UI Builder window

Actual results: Curvature options visible and editable

Expected results: Curvature options are not visible

Reproducible with versions: 6000.7.0a6

Can’t test with versions: 6000.0.0f1, 6000.0.83f1, 6000.3.23f1, 6000.5.11f1, 6000.6.0f1 (due to no Curved UI feature)

Tested on (OS): MacOS SIlicon Tahoe 26.6.2, Ubuntu 24.04

Notes:

• Once another element is selected the curvature settings disappear, so the UI is not properly updated when the Curved UI is disabled/enabled
• When the Curved UI is disabled and the curvature settings are still visible, the changes made to them are saved (visible in the Reproduction video)