If you have multiple Slide masters, you need to change them individually. The image below shows how I was able to apply two different themes to each slide master. Preserve Slide Master. In the end ...

When you edit the slide master, it will impact all other slides. If you edit the layout slides, it will only impact that one particular type of layout. We recommend that you that you edit the master ...

Rather than input the photo manually on each page of the presentation, you can use Powerpoint's Slide Master to place a .JPG photo into your header once, and have it appear throughout the ...