You have a template called "Fullscreen Rotator" which will only display a rotator on a page and no other content. This is meant to be used for your lobby monitors. 

To use this template:

1. Go to Media > Rotators > Add a new Rotator
2. Go to Content > Pages > Add a New Page in Ekklesia
3. Assign the "Fullscreen Rotator" template to the page
4. Assign the Rotator you created in Step #1 to the "Rotator" field in the page