[Frenzie]

I don't see a single continuous text unless I switch the display mode from page to continuous. That would suggest you either changed the default (change it back by long-pressing on page, third tab in the bottom menu) or the display for the single book.

PS I would argue that continuous is almost always worse.

Edit: related, you may have disabled "new page on…" in the Style tweaks → Pages menu. There are options to avoid blank pages on chapter start/end.