Steps to reproduce:

1. Open any Project
2. Reset the Customizable Toolbar and disable all Controls except Play Mode Controls
3. Resize the Editor Window so it's around half of your Display's size or less
4. Move the Play Mode Controls around both ends of the Toolbar, then set it in the center
5. Enable the Layout Control under Editor Controls and move it to the left side of the Toolbar
6. Resize the Editor Window to make it a bit smaller than before

Actual results: An Arrow button appears on the right side of the Toolbar, clicking it makes it appear on the other end of the Toolbar, this button obscures enabled Toolbar Controls

Expected results: No Arrow Button is present that has no functionality

Reproducible with versions: 6000.5.0a3, 6000.5.0a5

Not reproducible with versions: 6000.0.66f2, 6000.3.5f2, 6000.4.0b6, 6000.5.0a2

Tested on (OS): Windows 11