M iphone's screen goes big for no reason?

I was on my phone today and I accidentally clicked on an app. Well the screen went big so I exited out of it and it went normal but it immediately went big again. I was gknna call my dad from my mom's phone but my mom restarted my phone for me. But it did it again. And I had to restart it again. Why does it keep doing this?

This means you accidentally clicked the magnification app in settings
to turn it off go to settings, general, accessibility, and turn off zoom