To make sure all the slides in your PowerPoint presentation look the same, use the slide master. Apply fonts and styles, add multimedia, and insert footnotes. These instructions apply to PowerPoint 2019, 2016, and 2013; PowerPoint for Microsoft 365; and PowerPoint for Mac.
How to Use PowerPoint Slide Master
The PowerPoint Slide Master is like a style sheet for your presentations. Changes you make to the Slide Master are applied to the slides that are created after you format the Slide Master.
To open the slide master in a PowerPoint presentation, select View > Slide Master.
The Slide Master view contains all of the slide layouts used in PowerPoint. The Slides pane displays thumbnail images of the slide master (the top thumbnail) and the related slide layouts (the smaller thumbnails below the slide master).