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What is a thumbnail in pages?
Page thumbnails are miniature previews of the pages in a document. You can use page thumbnails to jump quickly to a selected page or to adjust the view of the page. When you move, copy, or delete a page thumbnail, you move, copy, or delete the corresponding page.
How do I enlarge the thumbnail of a PDF?
Resize page thumbnails
In the Page Thumbnails panel, choose Reduce Page Thumbnails or Enlarge Page Thumbnails from the options menu . Page thumbnails revert to their default size if you close and reopen the PDF.
