Sometimes I’ll write something in Hookpad in one mode or key only to realize after the fact that it’s really in another mode. For example, I’ll start writing in C major, and insert notes and chords with Bb in them, only to realize when I’m done that I never used B, and the piece is really in C mixolydian. For the purpose of exporting a proper score it would be nice to have the option to change the mode to mixolydian without changing the key or the notes. Right now if I change the mode to mixolydian, Hookpad assumes I want the same notes as the C major scale I was just in, so it goes to G mixolydian. Then if I change the key back to C all the notes and chords get transposed, which is not what I want.
It appears you can do this now. In Settings, choose “Mode changes are relative”, and choose a different mode under Key.
How about changing key without changing notes? That doesn’t seem to be possible.