How do I change the page size?

Android 

To change the page size to various standard fixed sizes, or to an infinite page, bring up the overflow menu (three dots in the upper right corner or menu key on some devices). Then choose Page settings, and select a size from the Page size drop down menu. 

Windows/Windows Phone

To change the page size to various standard fixed sizes, or to an infinite page, 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 size by tapping on the current page size. Then tap Done (checkmark icon) to save the changes.

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