Apply dropdown button is clipped in the override window. Refer the attached video

Steps to reproduce:
1) Create a new project
2) GameObject > 3D object > Cube
3) Drag to project browser o make a prefab
4) Add an empty gameObject to Cube prefab
5) In the Override window select Cube

Actual result: Apply dropdown button is clipped

Expected result: The button should not be clipped

Occurring on: 2020.2.0a7, 2020.1.0b5, 2019.3.9f1, 2019.3.0b6

Not reproducible with: 2020.1.0a12, 2019.2.0b5

Environment: Both Windows and Mac