After adding a cloth component in 3d Object, On editing the Cloth Constraints & Cloth self/ Inter collision window's then properties are not selectable in respective windows. Refer attached videos.

Step to reproduce:
1. Create a New project
2. Hierarchy > 3D Object > Cube > Add Component > Cloth > Edit Cloth Constraint.
3. Try to change any Property in Cloth Constraint Window and & Cloth self/ inter collision window

Actual result:
'Cloth Constraints' & 'Cloth self Inter collision' windows properties are not selectable.

Expected result:
'Cloth Constraints' & 'Cloth self Inter collision' windows properties Should be selectable and work gracefully.

Reproducible in:
2021.1.0a3

Working fine on:
2021.1.0a2, 2020.2.0b10

Environment:
Occurring on Windows 10 & macOS 10.15