contextual menu entries for moving tasks on Mac OS

Hi!

I am trying to move tasks from one list into another on Mac OS Mojave. I supposed it would  be that easy just to drag & drop the tasks, but that doesn't work. I read the manual and found out it should be possible with the context menu. But in my context menu appear only two entries:

- Mark as done

- Clear steps

(or similar, I translated the German context menu entries)

How do I get the entries to move tasks into the context menu?

Best, Dietmar