The navigation pane does not need to be present on your screen while scrolling through a PDF document. To maximize screen space, you could choose to hide the navigation pane.
1. Open one PDF
2. By default, PDF Reader will display the navigation pane to help you easily go through all pages. You can navigate through pages via thumbnails, annotations, outlines, bookmarks, and the results after OCR conversions.
3. You can see the “Pane” button in the bottom left of the window
4. Click it to hide the navigation pane (Click it again to reveal the navigation pane)