document region is the left side of navigation panel provide display different panels: level boards, panels bookmarks, thumbnails panel panels and accessories, through the left side of the tab to switch. The navigation panel can be folded or hidden, it is necessary to expand the region view the document, then hide the navigation panel. The following is a brief account of its principal.

(1) annex a list of panels: the left navigation bar click the "Annex" button, start panel annex, where the panel shows that all embedded in the PDF document attachments, and to provide users with a number of options to manage the annex, for example: open, save, add, delete and edit the description, security settings directly from the panel read out the annex to the location in the document. Click the button again annex, annex panel folding.

Figure 6 Annex panel

(2) page thumbnails panel: click the thumbnails tab page shows thumbnails of all the PDF pages, use page thumbnails to quickly jump to the selected page and drag the red rectangular box adjust the page view.

(3) Click the layer or a bookmark label, indicating the document contained in the PDF layer structure or a bookmark, the user can control the panel through the layers to show or hide a layer. Quick tour through the bookmarks file.