In Documents, you can scroll pages in vertical or horizontal direction (please note that horizontal scrolling is the default one on iPads).
To select the direction of scrolling, please follow the steps below:
Beside these scrolling options, you can also scroll through pages quickly by using the slider. It’s located either on the right or at the bottom of the screen depending on the scrolling direction you set.
Note: Please use the two-finger swipe in order to scroll through pages when the Annotation or Editing tools are active.