Page thumbnail view shows thumbnail images of all the pages in your document. In this view, you can rearrange pages and document sections, navigate to a page by tapping its thumbnail, and more.
Turn on page thumbnail view: Tap
at the top of the screen, turn on Navigator, then tap Done. If the keyboard is open, tap Done in the top-left corner to close it.

Show or hide page thumbnail view: Tap the page number at the bottom of the screen to show thumbnails. To close page thumbnail view, tap the handle above the thumbnails.