To view the table of contents in your iOS device (iPhone or iPad), tap the book once, while it is open in the book reader.

If you are having challenges viewing the entire page of a book, use the ‘Aa’ menu at the top right corner, change your reading orientation from Vertical scrolling to Horizontal scrolling, you will find that option at the bottom after clicking the ‘Aa’ icon on the top right. This will allow you scroll through a page by scrolling down and to change page you swipe left or right.