Just wanted to give some appreciation to this wonderful surprise of a feature that's kind of buried down a few layers of menu:
2nd tab in the top menu -> Font -> Font Settings ->
Generate font test document
It does exactly what I kept thinking about doing manually and then being too lazy to do: it takes some text and makes a book out of it, where each chapter is that text rendered in a different font you have installed.
This makes it easy to see what different fonts look like on an entire page without manually having to switch through all of them, which gets tedious when you have a lot of fonts.
There's a default text it can use, or you can make your own (very useful if you're reading in non-Roman alphabets).
Thank you to anyone who worked on this!
