Useful features for book filtering and organization

This is the app I've always wanted without having to always purchase audible matches. That's the most important takeaway here. However, 2 features I think would be useful are the ability to filter out by kindle unlimited books specifically, which I do see the ability to view by title, most recent Etc, but just having that option would be helpful. Second, the option to view by collection. I, and I have no doubt at least a few others, would very much appreciate that. Thank you for bringing this into Existence. i consume books in all forms I'm able, physically reading the book as well as listening to audio books.