Forum Discussion
Change background to all slides - 360
From Storyview you can select a slide - then select "Control+A" 2 times. This will select all of the slides, even the ones in different scenes. One the slides are selected, you can choose "Home > Apply Layout" to choose a different Master Layout for all of your slides.
Obviously this will only work if your backgrounds are created via the Master Slides.
If you have placed an image on each slide as a background. You can replace that image in the Media Library instead.
As RonPrice​ implied, you change the background on the Slide Master.
Here's more info about that:
Typically, when you change the Slide Master, the change shows up throughout the course. However, if the background fill of a given slide was customized, the new updated Master doesn't automatically override the customization.
In those cases, you can change multiple slides by selecting them, opening the Format Background window (use the button on the DESIGN ribbon), and then editing the fill.