On resizing editor from right side then Account, Layer and Layout buttons are disappears, Also again resizing the editor buttons are appears, Refer attached video.

Steps to Reproduce:
1. Create a New Project
2. Resize Unity Editor Window

Actual Result:
Account, Layer and Layout buttons get disappear.

Expected Result:
Account, Layer, Layout buttons display properly On resizing Editor window

Reproducible on:
2020.2.0a15, 2020.2.0a1,2020.1.0b13, 2020.1.0a26, 2019.3.15f1, 2019.3.3f1

Working fine on:
2020.1.0a25, 2019.3.2f1

Environment:
macOS 10.15