About Item Thumbnails and Page Thumbnails
A thumbnail is a miniature graphic of an image or a document. There are two kinds of thumbnails: Item and Page thumbnails.
Item thumbnails
Item thumbnails allow you to visually organize both your image and text files (e.g. JPEG, TIFF, PDF, HTML, Word or Excel files) on the PaperPort desktop. Item thumbnails are often referred to as desktop thumbnails.
Each item is represented by one thumbnail. In multi-page image items, you can move through the thumbnails for each page. You can quickly reposition and rotate items, and easily combine individual items into multi-page items. You can combine all flavors of PDF and image files into PDF file(s).
Note
Text type files (e.g. Microsoft Word, Excel) can only be combined into a PDF in PaperPort Professional if their native applications are installed on your computer and they support printing from their shortcut menus in Windows Explorer.
Before you can work with an item, you must first select its thumbnail on the PaperPort desktop. A red line appears around an item to indicate that it is selected.
To display Item thumbnails
On the Desktop ribbon, click the arrow next to 
Change View and then select 
Thumbnails.
Page thumbnails
You can use Page thumbnails for image items and PDF files, both on the PaperPort desktop and in the ImageViewer.
With the help of Page thumbnails you can
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simultaneously view thumbnails for a group of pages in multi-page image items or PDF files,
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navigate conveniently and effectively through these items and
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carry out the following page-thumbnail operations: reordering, inserting, or deleting pages and appending new pages. These operations are only available for PDF files (both on the PaperPort desktop and in ImageViewer) and MAX files (on desktop only).
To display Page thumbnails
On the Desktop ribbon (in desktop view) choose 
Thumbnail, or on the View ribbon (in Image View), choose 
Page Thumbnails in the View Options group.