Final answer:
To see all pages during Print Preview, the 'Multiple Pages' button should be clicked, offering a multi-page layout for review.
Step-by-step explanation:
To view all of the pages of a document in Print Preview, you should click on the Multiple Pages button. This button allows you to see more than one page of the document at a time, making it easier to review how the entire document will look when printed. Other options like Page Right move the view to the next page, One Page focuses on a single page at a time, and Page Setup is for adjusting print options rather than viewing multiple pages.