The shelves on Goodreads can be incredibly helpful if you’re on top of labeling your shelves. I personally have quite a few shelves. See?
Have you ever wanted to see two (or more) shelves at the same time? Maybe you’re curious about the number of mystery books you have in your to-read pile. Maybe you want to see how many historical fiction books you’ve read and own. I can show you how to do that since it’s not very obvious. (I’ve only discovered it recently and I’ve been using Goodreads for years.)
Select one of your exclusive shelves towards the top (read, currently-reading, to-read). Once you click on one of the exclusive shelves, if you scroll to the bottom of your shelves you should see ‘select multiple’ option.