Huh, didn't know this! I can't get it to work though. Where is this "Filter Results" button? I feel like I'm being really stupid, but I cannot see it. "Spells", for me, just opens up a pretty useless declaration of what's "covered in this chapter" followed by links to the (broken) spell list by class. It has sort options, but no filters that I can see. Where is this mysterious filter button, and what else can it do for me?