To change the current page background to various types of graph paper, lined paper, blank paper, etc. bring up the overflow menu (three dots in the upper right corner or menu key on some devices). Then tap Page settings and choose the background options you desire. Tap Apply to save the changes.
To change the current page background to various types of graph paper, lined paper, or blank paper, bring up the app bar menu by swiping from the bottom of the screen (Windows) or by tapping the three dots in the lower right corner (Windows Phone). Then tap Page settings, and select a background by tapping on the current page type. Then tap Done (checkmark icon) to save the changes.