These are the settings I have for fullscreen. On a Phone it scales perfectly, even with reward ads. But on Ipad it's scaled incorrectly. Do I have to create two different versions for Iphone/Ipad?
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Check out this tutorial
construct.net/en/tutorials/supporting-multiple-screen-17
Most common solution is to use Scale Outer mode, but you might need to make some changes to your game - bigger backgrounds, use Anchor for UI objects etc.