How do you get the background to fill the entire slide? Even if it stretches it.
Sherry, I'm not entirely sure what you are referring. The provided backgrounds should all fill the entire slide. Perhaps you are referring to custom backgrounds you can upload from a picture file? Those do not stretch to fill the entire slide, they are placed in the center of the slide and no further customization is possible at this time.
I found if you use "image slideshow" under "add item" that you can add a photo as background.
I have also created backgrounds using PowerPoint slides that I saved as picture files.
It is a work around, but can be time consuming if you are needing a lot of slides.
I just realized that you can't customize these slides.