The delete Button (on pc) is not supported. Backspace deletes selected Chords, Notes or one chord, note left from the cursor.
So i guess the Delete Button could be assigned to deleting selected Chords, Notes or one chord, note right from the cursor. This would be also the same behavior as any text editor everybody is used to.
By the way, i noticed after backspacing and undoing it with “Z” the blue cursorline disappears. Would be nice if it would be redrawn.