You can click the Pages panel in the Navigation pane to view the page thumbnails. To resize a page thumbnail, do either of the following:
- Right-click any thumbnail and choose Enlarge Page Thumbnails or Reduce Page Thumbnails.
- Click the
or 
icon at the top of the Pages panel to enlarge or reduce page thumbnails.
Note: Page thumbnails revert to their default size if you close and reopen the PDF document.