UI Shader Graph’s Main Preview has a right-click context menu with different preview options which do not work for a UI Shader Graph and does nothing when clicked

Steps to reproduce:

1. Create a new Unity project using the Universal 2D template
2. Create a new UI Shader Graph (Assets > Create > Shader Graph > URP > UI Shader Graph)
3. Open the newly created UI Shader Graph
4. Right-click in the Main Preview and select any option
5. Observe the Main Preview

Actual results: Nothing happens

Expected results: The options in the context menu should be disabled or some message/warning is shown to the user explaining that the Main Preview cannot be changed for this specific Shader Graph

Reproducible with versions: 6000.3.15f1, 6000.4.6f1, 6000.5.0b7, 6000.6.0a4

Can’t test with versions: 2023.1.0a3, 6000.0.74f1 (due to no UI Shader Graph)

Tested on (OS): MacOS Silicon Tahoe 26.3, Ubuntu 24.04