Hi Lori,
Thank you for your request. I am happy to help you here. After taking a closer look in your account, i noticed that your first content has a different screen ratio than the other contents (2000 x 2000px).
I took the liberty of modifying this content once and was now able to display it in full screen mode. I hope I was able to fix your problem and would appreciate a short feedback.
Greetings and have a nice weekend
viewneo Support