Unable to change Size & Offset value in Tiling Settings due to Shrinked input field in Terrain Layer Settings.

Steps to repro:
Open the attached Project.
Select Terrain game object > Select Any Terrain Layer.
Click on New Layer dropdown to expand.
Scroll down to Tiling Settings.

Actual Result:
Tile settings Size & Offset input field is Shrinked.

Expected Result:
Tile settings Size & Offset input field is not Shrinked.

Reproducible in:
2019.3.0b5.

Working Fine in:
2020.1.0a6, 2019.3.0b4.

Environment:
Only on Windows.