When empty staves are hidden and “Allow individual staves of multi-staff instruments to be hidden” is selected in Setup preferences - I cannot move the inner staves of a piano grand staff individually in Engrave mode. When I click on any of the inner/smaller Staff Spacing boxes they are all selected at the same time. And all of them move at the same time.
I can select each inner stave box and move them individually if I deselect the hide multi-staff option.
Is this a bug or a feature?