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Double Tap the screen with Three Fingers to turn the zoom off.
Or go to Settings > General > Accessibility and you can turn off Zoom from there. When Zoom is turned on, you have to use three fingers to scroll up and down.
Please let me know if that didn't work, so we can try different method to turn off the Zoom.
Remember, this is not my final answer. If my solutions didn't work please don't rate me bad or poor. Instead please reply back to me and I will continue to help you until we fix the problem or you are satisfied.