[Scene View] Grid and Snap Toolbars dropdown window do not close on clicking on it.

In the Scene view for Grid and Snap Toolbar, Grid Visual, Grid Snapping, and Increment Snapping dropdown windows do not close on clicking on it.

Steps to Reproduce:
1. Create a New Project
2. Scene View > Grid and Snap Toolbar > Dropdown > click again on the dropdown to close it

Actual result:
Grid and Snap Toolbars dropdown window does not close on clicking in the Scene view.

Expected result:
Grid and Snap Toolbars dropdown window closes gracefully.

Occurring on:
2021.2.0a17

Working Fine on:
2021.2.0a16

Note: New Overlays feature is Introduce in 2021.2.0a17

Environment: Occurring on macOS and Windows 10