I would like to see some additional options added to the To-Read page. The highest priority for me is to have a filter for books that I have NOT added to a reading challenge. I like to use my To-Read filtered on books I own to plan out my challenges. Currently I have to individually go into books to see if I’ve already added them to a challenge. With the new filter I could hide anything already added and start from a clean list.

Additional options that could be helpful: filter by hours for audiobooks, filter by average rating.