my SE Iphone is locked with large letters and numbers. cannot turn it off.

If your Home screen icons are magnified on your iPhone, iPad, or iPod touch

1. If you can't access Settings because your Home screen icons are magnified, double tap with three fingers on the display to zoom out.
2. To turn off Zoom, go to Settings > Accessibility > Zoom, then tap to turn Zoom off.

If your Home screen icons are magnified on your iPhone, iPad ...

helpwithSEIphoneissue Said:

"My SE I phone is locked in large letters and numbers. Cannot turn it off."

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Reset the Home Screen Layout...

Go Here: Move and organize apps on iPhone - Apple Support

Scroll to: Reset the Home Screen and Apps to their Original Layout

1. Go to: Settings
2. Tap: General
3. Tap: Reset
4. Tap: Reset Home Screen Layout