Amazon Prime app via Comcast tv - cannot see saved or favorites

Once one gets into the Amazon Prime App via Xfinity/Comcast (DVR, or probably via a smart tv too), how does one find saved Amazon Prime movies or playlists. Or at least, does anyone know how to search for anything in the Amazon Prime App served up via Xfinity/Comast? Seems to just be scrolling and seeing what is on the screen for selections.