How to View Two Pages at Once in Adobe Acrobat Reader
Adobe has renamed Adobe Acrobat Reader, a free PDF viewer, as Adobe Reader. You can view two pages at once in Adobe Reader by changing the page layout. The "Two-Up" setting displays two pages at the same time.
Open the document in Adobe Reader.
Go to the "View" menu at the top of the screen.
Select "Page Display" and highlight "Two-Up". Acrobat Reader will display two pages at a time. Use the arrow keys on the keyboard or the slide bar on the right side of the window to navigate between the two-page spreads in the document.