When you're looking at the books in your library, if you press on it the default is to attempt to download the book (which you don't have to do to listen), but to play you have to select the three dots, click on "title details", wait for that to load, scroll down and then press "play". Was gonna ask audible themselves if i could somehow change it, but there is no way that I've been able to find to contact them directly. 5⭐ if i could them contact directly and play from library.