Does anyone know how to do that on plasma 5.24.4?
It's a freshly installed Kubuntu 22.04.

Thanks, been searching on the settings and in the net for 20 minutes now..

Hi!

This has to be a sddm-setting, so use Systemsettings → Workspace → Startup and Shutdown → Login Screen (SDDM) → Behavior. If this does not work in Kubuntu you could use `kate /etc/sddm/sddm.conf` if it exists.