Screen has gone white

so I was trying to use the chop-chop to turn on my flashlight. It only works sometimes and I was getting annoyed with it. But somehow, I did something that has caused my screen have a white background all the time when it is on (even when the Moto display kicks in to notify me of things, it does so with a white background which I'm sure will suck the battery right down to nothing). Does anyone know what I did and how I can turn that off? It's terribly annoying.

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