I don’t think it has an easy “show hidden” feature. It can be done from the command line or via a script but not from a finder menu option.
Anyways, I had a mini breakthrough today. It turns out that somewhere along the way I’ve ended up with a duplicate directory system - except the double is hidden. Somehow, Blender ended up using this hidden path instead of the default, visible one.
I’ll need to investigate why this double is there, where it came from and how to deal ith it (and how much disc space it’s chewing up!!??)
If any Maccers know why I’d have a volume alias called “Macintosh HD 1” which targets the startup volume “Macintosh HD” and why I’d have a folder in the hidden Volumes folder called “Macintosh HD” then I’d be interested to hear.