Set caps lock to behave as shift lock

Hi there.

I am searching for a way to set the caps lock key to behave like a pressed shift key and use symbols instead of numbers and so on, when activated. I found an entry in the plasma system settings under hardware > keyboard > advanced saying (in german, so only a rough translation here): „caps lock works as locked shift. Shift ‚stops‘ caps lock.”

This seems to be right, but it doesn’t work, even after a reboot. Does anyone have ideas?

If the option is present

then that would suggest a bug in KDE. Maybe check the upstream bug trackers?