You can do quite a lot with the Adjust settings options, actually. There’s also a third option, “Custom”, where you can set any size between 0% and 150%. And when you tap&hold the screen for two seconds, you can also drag the whole image. This way, you can e.g. move the screen to the left, and create a space on the right,where you can place widgets that won’t block the game screen.
And if things go really wrong, simply tap the small broom icon, to reset the image position.