Why is the tablet zoomed in and wont let you in?

[AC Question]

My sisters tablet is zoomed in alot. She can't sign in, and enter any app. It says to change resolution but she doesn't know how to. When we find it it will not let us in.

 

[B. Diddy]

Welcome to Android Central! Which tablet? Are any of the Accessibility options turned on, like the screen magnifier?