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On the View tab, select Slide Master.
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Select the first slide in the navigation pane.
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Select the image of the logo and press Delete.
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When done, select View > Slide Master tab > Close Master View.
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On the View tab, select Slide Master.
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Select the first slide in the navigation pane.
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Select the image of the logo and press Delete.
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When done, select View > Slide Master tab > Close Master View.
Adding and removing a logo isn't currently possible in PowerPoint for the web. You can, however, adding and remove a logo in the PowerPoint desktop app.
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To open the desktop app, at the top of the ribbon, select
 Editing and choose Open in Desktop App. ​​​​​​​
Don't have the PowerPoint desktop app? Try or buy Microsoft 365.