To enable DocArchive to show the outline that exists in a PDF can be done by clicking ‘Show Outline’.
The PDF needs to have bookmarks an outline to be shown. If it does you will see the following in the thumbnail column. Clicking on any bookmark will display the page where it is located.
Notice that there are now two vertical tabs shown on the left side of the thumbnail column.
The Outline tab is currently activated.
Clicking the Thumbnail tab located above the Outline tab will return the column to showing thumnails.