I don't use the PRV; I have more experience with the Staff View.  When I change the "key" [short for "key signature"], the key signature changes.  However, if I had any notes previously entered as B when the key signature is changed to F, Bb, Eb, etc. the existing notes do not change to Bb; they remain as B natural. All notes added after the key change (to the right on the staff) are added in the new key based on the key signature. I assume the PRV works the same way, but maybe not. It
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