PDF Expert for Mac uses continuous scrolling when you scroll pages. To disable continuous scrolling and scroll pages one by one, use the arrow keys ← → .
In PDF Expert, you can scroll pages in vertical or horizontal directions. Horizontal scrolling is the default one on iPads.
How to choose the scrolling direction:
You can also quickly scroll through pages using a slider. It’s located either on the right or at the bottom of the screen depending on the scrolling direction you set.
Note: When any annotation or editing tools are active, please use the two-finger scrolling to navigate your document.