Reproduction steps:
1. Open the attached “BugRepro” project
2. Open “Scenes/SampleScene” Scene
3. Enter the Play Mode
4. Double-click on empty space in the Game View
5. Click on the “Inner Planets” label in the Game View

Expected result: The “Inner Planets” label is selected
Actual result: The “Inner Planets” label isn’t selected, only the background panel goes into focus

Reproducible with: 2022.3.14f1, 2023.2.1f1, 2023.3.0a15
Couldn’t test with: 2021.3.32f1 - Error: {{error CS0122: 'TreeView' is inaccessible due to its protection level}}

Reproducible on: Windows 10
Not reproducible on: No other environment tested

Notes:
- To select the “Inner Planets” label, you need to double-click it
- To expand the list, only one click is required on the arrow