I cant get out of zoom mode

Double tap the screen with 3 fingers, or say Siri, zoom out.

"I cant get out of zoom mode: I was trying to make my text a tiny bit larger and it went huge and I cant get back to normal. Cannot even use my phone now."

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Stalled iPhone Screen:

See if a Force Restart fixes this, and bring is back to normal, once booted back in. Go here: Force Restart your iPhone - Apple Support