With some of the longer challenges it can be difficult to tell at a glance which prompts have been completed and which haven't, especially if you've already added books to the prompt. It would be nice if the prompts were sorted by incomplete/complete either automatically or as an option. Especially with challenges with 100+ prompts, it's a lot of scrolling and if you're 90% done, it can be difficult to spot the incomplete prompts. Even just having the entire box change colors or something like that would be a big help when trying to spot which prompts you're missing.