PDF Expert allows you to quickly navigate a long document by jumping to a specific page:
You can also reach this window by pressing the Option+CMD+G shortcut or by clicking on the page number in the bottom right corner of the page and entering the page number.
You can also easily navigate across pages using the Thumbnail view of the app, Outlines, and Bookmarks .
Note: 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 ← → .