[tomsem]

Scrolling is toggled in Themes & Settings (the 'Reading Menu' by default in lower right corner). UI seems perhaps a little different, but I don't use it often enough to identify what may have changed. And I cannot find any reporting that anything about Books has changed.

Note that some options are found in Settings app (e.g. auto-hyphenation, reading menu position, status bar display, page turn animation option).

My only reference is running on an old iPad and iPhone SE (both iOS 15) and it compares very favorably to that. Used to waste a lot of space on headings and other UI elements. Maybe it goes too far in the other direction now, but I actually like it.

I dislike skeuomorphism myself. That went away a long time ago, I never want it back.