Sorry to ask, Finale used to allow that:
Show slashes ONLY in parts but not the score.
Related, is there a way to see slashes (in score or parts) but actually hear the music the slashes cover up.
I guess you would have to hide the actual music…
Ok. To answer my own question:
If I use single bar repeats Dorico will loop the last measure before the single-bar repeats start in the audio. Very cool!
I know it’s probably all in the manual…