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I have my default page size set to 800x480 in the project properties, but when I open the application in the test screen, it defaults to 320x480. Is there a way to set the default screen size for the test (Mobile Preview)?
Hi Shawn, you can choose the resolution in the top of preview window: 
it has most common resolutions for mobile devices.
By default you are always starts with mobile app but you can change that - Tablet App has by default 1024x768 resolution, a Windows 8 App has different display resolution.
Thanks. That can only be done when the app is created, not after. It would be nice if the Mobile Preview used the default page size in the App Settings.