Dorico Pro 5 here. My Horns in F (no key signature) sound exactly as written. But I would the written middle C to sound as F3, as is the case in all the scores I’m transcribing.
I found this using ‘edit instrument definition’:
I would like my score to be a ‘transposing score’. How do I achieve that? (And, just out of interest, why is that not a default when using transposing horns? Doesn’t the choice of ‘Horn in F (no key sig)’ from the instrument list imply that the instrument transposes?)