Create page thumbnails
Because page thumbnails increase file size, they are not automatically created. After you create page thumbnails, you can embed them in the PDF. Embedding prevents the page thumbnails from redrawing each time you click the Pages button, often a time-consuming process. Embedded page thumbnails won’t reflect changes that you make to document pages until you unembed the page thumbnails.
Create page thumbnails
Click the Pages button on the left.
Page thumbnails appear in the navigation pane. This process may require several seconds, particularly in larger documents. The drawing of page thumbnails may pause if you interact with the application during this process.