Choose My Paper Size?

In the Print module, click on the Page Setup button at the bottom of the left side Panels area. When the Page Setup dialog appears (shown above; this is the Mac version), choose your Paper Size from one of the presets in the pop-up menu (here, I chose the standard US Letter size, 8.5×11″, with borderless [edge-to-edge] printing). That’s it—pick one of the preset paper sizes and click OK.