Had the same problem on arch months ago. You may find it under Mouse/Touchpad settings. "Screen Edges"
KDE
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
Plasma 6 Bugs
If you encounter a bug, proceed to https://bugs.kde.org, check whether it has been reported.
If it hasn't, report it yourself.
PLEASE THINK CAREFULLY BEFORE POSTING HERE.
Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
Oh fuck it's called "edge barrier" and is expressed in pixels. I think I overlooked it because I thought that was some setting to do with the hot corners. @#$%! Thank you!
thank you for this! my one minor gripe
It's been driving me nuts.
it's the virtual screen edge thingy in the monitor settings i think
Nothing like that in monitor settings.
I posted exactly the same thing a short while ago
https://lemmy.world/post/23955013
I found I had to set both of those items or it didn't entirely go away.