Steps to reproduce:
1. Open the attached “IN-93216.zip” project
2. In the Scene View, click the “Layer” drop-down field
3. Click it again to close it

Expected result: The drop-down closes
Actual result: The drop-down reopens

Reproducible in: 2021.3.47f1, 2022.3.56f1, 6000.0.35f1, 6000.1.0b1
Couldn’t test in: 6000.1.0b2, 6000.1.0b3 (A bug where the drop-down field doesn’t even appear was introduced)

Reproducible on: Windows 11, Windows 10
Not reproduced on: No other environment tested

Notes:

• Not reproducible in a new project
• This also happens with the “Gizmos”, “Tool Handle Rotation” and “Tool Handle Position” drop-down fields