The preset window does not open on single click, opens on double click. Refer the attached video

Steps to repro:
1. Create a new Project
2. Hierarchy > 3D Object > Cube
3. Select Cube to view in Inspector
4. Click on Preset Icon of any property (Box Collider, Mesh Renderer)
5. Close the Preset window
6. Click on the Preset Icon again

Actual Result: Preset window opens up and disappear

Expected Result: Preset window opens up

Reproducible with: 2020.1.0a15

Working Fine with: 2020.1.0a14, 2019.3.0f1

Environment: Only on MacOS 10.14