To move a PDF page:

Choose View > Sidebar.

Choose Thumbnails from the pop-up menu at the bottom of the sidebar.

In the sidebar, drag the page to its new location.
You can reorder the pages in a PDF document by dragging them in the sidebar.
Choose View > Sidebar.
Choose Thumbnails from the pop-up menu at the bottom of the sidebar.
In the sidebar, drag the page to its new location.