How can I hide Key Signature for a selected system; or how can I create a Player without key signature.
My aim: a singer (Psalm) without Key signature and an organ e.g. in Eb
In Write mode: Select something at the start of the vocal stave.
Type shift-K for a new key signature. Type C into the popover (for no sharps or flats). Then tap Alt-Enter (to only apply it to that stave).
I think you could also write open or atonal in the key signature popover, then alt enter.