Across all Apple devices, there is a circular icon that shows you both that a book is being downloaded, and how far along that download is. It's particularly easy to miss on the iPhone ...

The audiobooks are listed in the Books app as "Narrated by Apple Books." Clicking on the information icon next to that line brings up a text box that clarifies the book is narrated by "a digital ...

Apple Books has not received much love in iOS 15 ... There’s a single tappable icon at the bottom of the book interface to access the settings. It provides a distraction-free reading experience.