Subject recognition in Photos is wonderful, but the subjects album doesn't show many categories.

I waited years for this feature to be included in Photos. While the DSM 7.x update and migration to Photos went very smoothly, when I look at the subject album in Photos, it’s showing a very small list vs what I know it’s detected.

For example, the album does not have a subject for “bird”, yet I can search for “bird” and it will show me birds.

Is there any way to see a list of what subjects it can detect, or a way to force showing ALL of the detected subjects in this subjects album?