Unhiding people from People & Pets album in Photos for MacOS

I'm using the latest Photos app on an M4 Mac mini. It's doing a great job of recognizing faces in my 185K library. A lot of different people were identified in the People & Pets album. I chose to hide some of them just to make the album size manageable.

But now I'd like to unhide them, or at the least see a list of all the names that have been identified. How do I do this? It seems like all the hidden names from that album are 'lost' somehow.

Any advice appreciated.

[Re-Titled by Moderator]