Tap the icon at the bottom right of the screen. You may have to tap on the screen for it to appear. Tap "Contents". Then, select where in the book you want to start. You can go all the way back to the cover or the table of contents or the first chapter, whatever works for you.
See this article for pictures:
Tap the icon at the bottom right of the screen. You may have to tap on the screen for it to appear. Tap "Contents". Then, select where in the book you want to start. You can go all the way back to the cover or the table of contents or the first chapter, whatever works for you.
See this article for pictures:
Read books in the Books app on iPad - Apple Support