When you select Book fold for your page setup, Microsoft Word prints two pages on one side of the paper. When you fold the paper, it opens like a book. This option is intended for documents that have more than two pages.
How?
When you create a booklet, it's best to start with a new, blank document so that you have better control over the placement of text, graphics, and other elements. You can add a book fold to an existing document, but you may have to reposition some elements once the book fold is in place.
If your document is not set to landscape orientation, Microsoft Word sets it to landscape.
If you need even more space along the fold to accommodate binding, type or select the amount of space you want in the Gutter box.
If the number of pages in the document exceeds the number of pages you select for a booklet, Word prints the document as multiple booklets.
For Help on an option, click the question mark , and then click the option.
Set options for printing on both sides of the paper.
If you're
using a duplex printer (one that automatically prints on both sides of the
paper)
Click Properties, and then set the options you want. If you have a choice of setting the page orientation and duplex options, select landscape orientation, and flip the document on the short edge or short side.
If you aren't using a duplex printer
In the Print dialog box, select the Manual duplex check box. Word will print all of the pages that appear on one side of the paper, and then prompt you to turn the stack over and feed the pages again.
If you click Current page or Pages, Word prints the page you indicate, plus the three other pages that belong on the same sheet of paper.
If you click Selection, Word prints your selection using the default page layout instead of booklet layout.