Gizmos Property dropdown under the Physics 2D in Project Settings window doesn't expand until the mouse cursor is moved, refer to the attached video.

Steps to Reproduce:
1. Create a New Project
2. Edit > Project Setting > Click
3. Project Setting Window > Physics 2D > Gizmos > Click

Actual Result:
Gizmos Property doesn't expand until the mouse cursor is moved

Expected Result:
Gizmos Property expand irrespective of the mouse cursor

Occurring on:
2020.2.0a3, 2020.1.0b2, 2019.3.6f1, 2018.3.14f1, 2018.3.0a4

Working Fine on:
2018.3.0a3

Environment:
Windows 10 and Mac 10.14