How to change d pad size on minecraft pocket edition?

I gave my iphone to my sister to play on minecraft but she, for some reason, made the d pad size so big I can't change it because it's covering the button to change it, If I delete the app, I'll have to pay 4.99 for it again and all my worlds that i've created will be gone.

Go to options, find d-pad size, and make it smaller by moving the slider. I guess it's under the section with the game pad on it

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