Key editor always editing one track at a time?

Using Cubase 10.0.50. Perhaps I’m missing something here. Several midi tracks open in the midi key editor, want to draw a velocity curve on all of the selected notes of all tracks. “edit active part only” toggle is switched to “Off” -> But the behavior is as if it’s always “ON” no matter what the button is set to. Can’t edit them all at once anymore. This will probably be the same in Cubase 10.5 (will test when I find some time)