Created attachment 104326 [details] sceenshot I'll simply add a screenshot that tells everything. When I scroll, the content is not "hidden inside the window" I'm using Opensuse Tumbleweed
Not sure if this is specific to how the kscreen kcm embeds its QML controls, or if other QML based modules (e.g. try the kwin effects list) behave similar.
It's a Wayland bug, nothing specific to KScreen (it's also known, but I can't find the reference right now). Thanks for taking the time to report this, though!