Hearthstone not fullscreen

Technical Support
I just recently got a Lenovo Yoga and I downloaded Hearthstone but it will not open up to anything but a tiny little screen. It will not go fullscreen or anything like that. Is there a way to fix it or just hope that Blizzard is going to eventually create a Hearthstone App?
its windows 8.1 if that makes any difference
nvm please delete this

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