Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Install the Multiplayer Play Mode package (com.unity.multiplayer.playmode)
3. Open the Project Settings window (Edit > Project Settings)
4. Open the "Playmode" tab in the Project Settings
5. Click the "+" button to create a new Player Tag
6. Enter any name
7. Click the "Save" button
8. Make sure no Player Tags are selected
9. Observe the "-" button
10. Click the "-" button
11. Observe the Project Settings window
12. Delete all Player Tags
13. Repeat step 9

Actual results: The remove “-“ button in the Multiplayer Player Tags does not delete anything when clicked if no Multiplayer Player tag is selected but is also not disabled

Expected results: The remove "-" button is disabled if it's not going to do any action when pressed

Reproducible with versions: 6000.0.66f1, 6000.3.5f1, 6000.4.0b5, 6000.5.0a5

Tested on (OS): MacOS Silicon Tahoe 26.2

Notes:

• The remove "-" button is not disabled when the list is empty and nothing can be deleted, it can still be clicked
• The remove "-" button is disabled in the Editor Tags window if the list is empty, if nothing is selected it removes the last element when clicked