Split screen

I'm trying to help a teacher who uses her iPad and Doceri on a daily basis, but today it is not working correctly. She uses it to show what is on her "extended" screen through a projector. Today, her Doceri is showing half of screen one (her computer) and half of screen 2 (her extended screen). I've attached a picture. Does anyone have a fix for this? I tried changing her display settings for her extended screen and that didn't change this.

Thank you!
Carol Smallwood