No padding if you maximize a window

I'm not able to get the "No padding if you maximize a window" feature to work.

I enabled it with Use Classic BetterSnapTool Resizing but there is still padding around the windows.
What am I doing wrong?

Not 100% sure, but switch to "Integrate With Native System Resizing":

if you are on macOS > 15 and disable "Tiled windows have margins"

Thank you!