Are you using any type of 3rd party launcher or theme @Lorand
As a process of elimination can you put the phone in Safe Mode which disables any downloaded apps and leaves the stock ones Live and then see what happens.
If all else fails back up , remove any relevant Sd card and factory reset.
Daily Driver > Samsung Galaxy s²³ Ultra 512Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "