When you make changes to layout masters and the slide master in Slide Master view, other people working in your presentation (in Normal view) can’t accidentally delete or edit what you’ve done. However, the majority of changes that you make will most likely be to the layout masters related to the master. When you edit the slide master, all slides that are based on that master will contain those changes. The related layout masters appear just below the slide master (as in this picture from PowerPoint for macOS): The master slide is the top slide in the thumbnail pane on the left side of the window. To open Slide Master view, on the View tab, select Slide Master:
When you want all your slides to contain the same fonts and images (such as logos), you can make those changes in one place-the Slide Master, and they'll be applied to all your slides. PowerPoint for Microsoft 365 PowerPoint for Microsoft 365 for Mac PowerPoint 2021 PowerPoint 2021 for Mac PowerPoint 2019 PowerPoint 2019 for Mac PowerPoint 2016 PowerPoint 2016 for Mac PowerPoint 2013 PowerPoint 2010 PowerPoint 2007 PowerPoint for Mac 2011 More.
