Hi Loren, and thank you for the question :) 1. The Monster List can be sorted already by Name, Size, Type, Alignment, AC, HP & Senses. You can see them in the blue buttons just above the first creature. Challenge Rating is something we would like to see sortable too, and are discussing with Roll20 that option. In the meantime, here's a gift of a Monsters by CR page :) <a href="https://roll20.net/compendium/dnd5e/CategoryIndex:Monsters%20by%20CR%20(ToB)#content" rel="nofollow">https://roll20.net/compendium/dnd5e/CategoryIndex:Monsters%20by%20CR%20(ToB)#content</a> 2. In-game there is a marker next to each creature that says TOB. I do not believe Roll20 offers an in-app sort feature at this time by source, but will bring it up with them!