Keyboard layouts, "additional layouts" dont seem to work

I use 2 layouts because I am a german and coding is really bad in QWERTZ.

I also want to learn KOY, but I want it to be my “extra layout” which I need to activate with a shortcut or the systray icon, not with capslock, which is my normal layout switcher.

This setting doesnt seem to work.

  • I enable “additional layouts”, the preset is “2” ? why 2, this makes no sense?
  • It doesnt seem to work, I can still switch through all of them
  • There is no box or anything to set a layout as “additional”

does anyone know how to use this?