First, make sure you have the right paper size selected by choosing File > Print Setup (Windows) or File > Page Setup (Mac) and selecting your paper as necessary using the pop-up menus.

Switch to Layout mode ( in Windows, on the Mac), and choose Layouts > Layout Setup (Figure 15.9).

Figure 15.9. Choose Layouts > Layout Setup to change margins.

When the Layout Setup dialog box appears (Figure 15.10), select the Fixed page margins checkbox and use the four number-entry boxes to adjust your Top, Bottom, Left, and Right margins. Check Facing Pages to account for a narrower inside margin if you’ll be printing on both sides of the paper.

Figure 15.10. Select Fixed page margins and enter new numbers to adjust your Top, Bottom, Left, and Right margins.

Click OK.