The column layout menu does not appear on the burger button.
It appears outside the Project Window. Refer attached video.

Steps to Repro:
1. Create an empty project
2. Select burger button form Project Window

Actual Result:
Column layout menu appears outside the Project Window on selecting burger button.

Expected Result:
Column layout menu appears within the Project Window on the burger button.

Reproducible on:
2020.1.0a5

Working fine on:
2020.1.0a4, 2019.3.0b4

Environment:
Occurs only on Linux (ubuntu 16.04 LTS)