IPhone 6s icon/screen slightly larger than others?

I've noticed my iPhone 6s screen was kind of big. It's noticeable when going through apps or settings and especially the previews for messages and the text bubbles themselves. I put my phone side to side with two of my friends phones (with both 6 & 6s) I found that my phones text bubbles and preview area things were maybe 1 1/2x the size of theirs but it didn't take until I saw everyone else s phones to realize mine was bigger. It has nothing to do with the zoom feature and my phone says it's on standard so I don't know how to get it smaller. I d like to change it back but I don't know how it got this way or how to change it back. Please help, my phone was set up in the Verizon store and has been this way since I got it. Id just like to know how to change it to normal, smaller setting

Bfdddd

It's something you can change in Settings>>Accessibility