As of tonight, the categories are:
Action & Adventure
Beats & Related
Crime & Mystery
Current Events & Issues
Fantasy, Sword & Sorcery
UFO, Paranormal & etc
This may grow soon to include Poetry, Suspense, Health & Nutrition, whatever my needs end up being. I hope this proves to be a time-saver for you, the reader. Thanks.
p.s. - if you click on a category and find the shelf is just empty and you can't figure out how to get books back, just go to the top of the lists and click on All, or down a ways and click on All Books. One of those actions should bring the books back. I have stuff cross-indexed, do if you have Favorites and Classics clicked at the same time, you might just see only one book or none at all.