Click on the Table of Contents icon to open the "Table of Contents"
Tap or Click the title of the page you would like to open
Click or Tap the right/left edge of the page
Click and Hold or Press and Hold the top left/right of the page and swipe
Use the left/right arrow keys on the keyboard
Click or Double Tap the section of the page you want to zoom in to
Double Click or Double Tap anywhere on a zoomed page to zoom back out