Unless I am the only one in this entire world with a kindle Fire HD 10 OS 7.3.1.6 (updated October 9, 2020), beginning to think so, I have not found any information other than the tablets pop-up about this change. I loved the 9-page layout. Now we are down to three-page layout. My wife and I have the same Kindle Fire HD with the same OS version, hers still has the old-style layout. Oddly enough mine didn't change to the new one until about 3 weeks after the update. The Page layout didn't change until first week of November.
The library layout is nothing special compared to the older layout. As you can see in my image below it just shows, Kindle for example, books I already have and tapping on Kindle takes you to the Kindle app or tapping the book opens the book. Why do I need the kindle app icon sucking up screen real-estate for? If I wanted to see that view, I would just tap on the Kindle app to see my book. This makes me want to root the device.


