Disappearing gaps stopped working on macOS 15.1

Good afternoon! Today we upgraded a colleague's macbook to version 15.1 and he stopped having the option when there is no gap between two windows or for one large window. Sometimes somehow he manages to open a window normally, but it happens randomly.

I might not understand the question correctly, but maybe this?

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That sounds very much like the right thing to do. I just can't find a user to test it for the second day. Thank you so much for your help!