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On the View tab, select Slide Master.
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In the thumbnail pane on the left, select the master slide at the top or one of the layouts below and make your changes. For more details, see Customize a slide master.
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When you're done, select
 ​​​​​​​Close Master View.Â
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On the View tab, select Slide Master.
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In the thumbnail pane on the left, select the master slide at the top or one of the layouts below it, then begin making your changes. For instance, on the Slide Master tab, you can use the Colors, Fonts, and Background Styles options as needed to customize the master and layouts. For more details, see Customize a slide master.
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When you're done, select
 ​​​​​​​Close Master ViewÂ
Changing a slide master isn't currently possible in PowerPoint for the web. You can, however, change a slide master in the PowerPoint desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop App.
Don't have the PowerPoint desktop app? Try or buy Microsoft 365.