Starring PDFs is great but, you usually star PDFs that you use ALL the time and that you want to have displayed at the top of the Home tab. But what if you don't want to have them displayed up at the top but you want to have them in a place where the rest of the similar PDFs are, that's where a very useful feature called "Labeling" that would be great to have in Acrobat comes into play. It would be the ability to make custom labels (e.g. School or Work, or ProjectX) for PDFs so you could have them all in one place. I'm currently working on a university project and there are lots of PDFs I use frequently so if I could add a custom label for them all, let's say, "Current project" and then have access to them instead of having to scroll through the recently used PDFs on the Home tab. I've attached the picture of how I thought it could be added.