Hi,
I'm using czech keyboard(Czechia layout) for programming and i've used AltGr(Right Alt) to write special signs as $@[]. Now it doesn't work.
I'm using Arch Linux, but i know that problem must be somewhere in KDE settings, because in GNOME everything works as before.
Can somebody help me at least what to search in KDE settings? Thx

did you do a upgrade or something else, after which it didn't work as before?
does it work correctly as a new user?

this is a guess

systemsettings -> hardware -> input devices -> keyboard -> layouts -> configure layouts -> add layout -> layout variant -> International (AtlG dead keys) -> ok

International (AtlG dead keys) didn't helped me, because it's American keyboard and i want to use Czechia
So I've crated new user and set up czechia keyboard via :
systemsettings -> hardware -> input devices -> keyboard -> layouts -> configure layouts -> add layout -> Czechia
Then i tried to clean layout list at my user and add Czechia again and it works again.
Thanks for hint