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If you are one of the users using Microsoft Office 365, you would have come across this small feature in PowerPoint 365, especially on the Windows desktop clients, which shows up a pop-up when you have more than 25 unused slide masters in your PowerPoint slide.
How to clean up unused PowerPoint master slides in PowerPoint?
Your message will look something like this.
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“PowerPoint found a large number of unused slides. Review Slide Masters by going View > Slide Master PowerPoint can also remove unused Slide Masters for you Perform Clean-up (Recommended ? )”.
You can accept or decline to cleanup.