Thumbnails images are small representations of larger images. Thumbnails give you the ability to view multiple images at the same time.

Click Show/Hide Thumbnails to view thumbnails of all pages in the document and move among different pages by selecting individual thumbnails. Manually configure the width of thumbnails. Resize the thumbnails area by dragging the splitter left or right. The size of the area is saved even after you refresh the page.

Also, thumbnails let you focus on a specific area of the image. To focus on different areas, drag the highlighted area.