Upon installing Faithlife Ebooks app, it opens normally, however, when closing and opening again, it just opens to the in-memory area (I'm sure that is not the correct terminology) and cannot be displayed (opened).
To save some time on the pre-diagnostic steps, I have removed and reinstalled the app with the same result.
BTW: The Bible app works just fine. This issue is just with the Ebooks app on my iPad (Android works fine).
iPad 6th Generation 128G
IOS 12.1