vertical rectangular box appearing while moving windows (when BTT on)

[cme4ever]

A vertical rectangular box appearing while moving windows (when BTT on)
A vertical rectangular box not appearing while not moving windows(when BTT on).
No vertical rectangular box appearing even moving windows(when BTT off).

[Andreas_Hegenberg]

Getting a white border around Stage Manager's strip

thanks, so easy

[cme4ever]

thanks so much.. Andreas..