Is there a way to transpose chord symbols or do I have to re-write them?
Yes, they will transpose with the dialog just as well as notes. Of course they must be selected first. Perhaps the issue is selecting?
Note able to do it even after selecting the chord symbols. Everything transposes except the chord symbols. Perhaps there’s some setting that I am not aware of?
Have you tried this? Your help would be much appreciated.
Of course, I’ve been doing it for some time now, in Dorico 3 and 4. Have you seen the instructions in the User Guide?