I have a 10-instrument score. They all appear on screen, and they all sound correctly when I play back. But when I go to extract the parts, the trombone part does not appear on the list in the Extract Parts dialog box, and I therefore can't extract it. Any clues why this might be happening and how I correct it?
(This is similar to a query four years, to which no responses were given)
(Finale 25 on Windows10)