The page navigation will allow you to navigate throughout your document in a direct way. By clicking on the icon you will access the full view of the bar, which is the place where you will also customize how many segments you want to display per page.
When performing segment validation, you might need a faster page navigation to go to the start or end of your document. To do so, simply click on the icon to open a window with a list of all page numbers. Leave it open and push it into the widget area to keep a quick way to navigate the pages.