The Navigation panels include bookmarks, page thumbnails, destinations, signatures, comments and attachments that help you to view and review PDFs.
To show or hide the Navigation panel:
- To show the Navigation panels, choose View > Navigation panels > [desired panel], or select desired panel from the Navigation toolbar menu on the View toolbar.
- Click at the bottom of the vertical bar that separates the Document panel from the Navigation panel, to show or hide the Navigation panel.
- Click at the top of the vertical bar to hide the Navigation panel.