Whenever I am presenting bible verses, the slides either don't have a background or the "wrong" background keeps repeating. Is there a way to pick one background, either an image or video, and keep that background slide after slide until I decided to change the image or video. For example, we have a background to remind people to silence their phones but this background sometimes repeats after each bible verse is selected. I tried following the background guide in the Howto section but it didn't help