Noel,
It never ceases to amaze me how much useful info can appear in these forums.
On your screenshot of the Chord Display Dropdown, I spotted "Guitar Capo (Visual Transpose). How did I prevously miss that?

Co-incidentally, today I am working on a song in F but because I want to fingerpick guitar the chord shapes in D with capo on 3 are more suitable, problem solved.

I only wish that this and some other settings could be made song specific and not global, since unless I reset, it messes up the display for subsequent songs.

Regards
Vintage