Composer->FAQ  [ Editing | Play & Sound | Import & Export | Printing | Troubleshooting | Misc | Search]

Can you move a note instead of deleting and re-entering it?

For any selected note(s), Ctrl+Shift+(up/down arrow keys) will move the note(s) up and down on a staff.

You cannot move just one note in a chord. However, you can place your insertion point to the right of the chord member and press Ctrl+Backspace to remove the chord member.