Step 8
When your settings are ready, click OK to close the Page Setup (PC: Print Setup) dialog box. Now take a quick look at the rulers at the top and left sides of the center Preview area to confirm that your page is set up to 8½ x 11 inches.
If Lightroom’s rulers aren’t visible, go to the Layout panel, down to the Show Guides section, and turn on the Rulers checkbox. While you’re there, scroll up a little to the top of that panel and make sure that the unit of measure shown is Inches (see Figure 8).