In UI Elements samples window, Scrollbars overlap with each other when the window size is resized, refer to the attached video.

Steps To Reproduce:
1. Create a new Project
2. Window > UI > UI Elements Samples
3. Resize window horizontally

Actual Result:
Scrollbars overlap with each other.

Expected Result:
Resizing the window doesn't affect the UI inside it.

Occurring on:
2020.2.0a1, 2020.1.0a26, 2019.3.3f1, 2019.3.b1, 2019.3.a4

Working Fine on:
2019.3.a3

Environment:
Windows10 and macOS 10.15