Show or hide the navigation pane

The navigation pane is an area of the work space that can display different navigation panels. Typically, these panels act like a table of contents, with items you can click to jump to a specific place in the document. For example, the Pages panel contains thumbnail images of each page; clicking a thumbnail opens that page in the document.

When you open a PDF, the navigation pane is closed by default, but buttons along the left side of the work area provide easy access to various panels, such as the Pages panel button  and the Bookmarks panel button . When Reader is open but empty (no PDF is open), the navigation pane is unavailable.