Before inserting the brochure, your letter should be folded properly into a standard business-size (No. 10) envelope. From the bottom of the letter, fold it up one-third of the way.

Select "Portrait" to make a horizontal fold brochure or "Landscape" for a vertical fold brochure. Click "Size" in the Page Setup section and select the 8 ½-inch by 11-inch "Letter" size.