In Factbook Person > Supernatural in the sidebar works as I expect. But in the library I need to go Factbook > Other > supernatural. Shouldn't this be consistent in to two sidebars?
Yes, it should be consistent. However, I'm not seeing exactly what you describe.
"Supernatural Being" is under Person, but I don't see any entry for that in the Library "Factbook" facets (at least in my library).
"Supernatural" is a distinct entry in Factbook under Concept, which matches the "Other" in the Library facet.
Does that meet your expectation?
No, but it helps me figure out why the Factbook structure leaves me uncomfortable. I see where I went wrong. Thanks.