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 Play Mode Scenarios dropdown next to the Play Mode button
4. Select "Configure Play Mode Scenarios"
5. Create a new Scenario with the name "asd" by pressing the "+" button
6. Repeat step 5
7. Observe the Play Mode Scenarios window

Actual results: Text edit outline red but no informational tooltip/helpbox/warning appears, and pressing Enter just finishes the editing with no Scenario created

Expected results: There is some sort of informational popup letting the user know that a Scenario already exists with that name, pressing Enter should not make the editing disappear

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

Tested on (OS): MacOS Silicon Tahoe 26.2

Notes:

• Creating new Tags for example shows a popup with an informational message that the Tag with the same name already exists and does not let the user create a Tag