Hello Lillian G,
Thank you for reaching out to Microsoft Community. We're happy to support you with your concern.
Based on your sharing, it's likely that you're recording the PowerPoint slide in the Record Slide Show feature of PowerPoint Desktop app and the slide's having a circle in a bottom-right corner like this:
The reason there's a circle like that is because you're recording with the camera opens, so it will have a circle there to record the video. To turn that off, you just need to toggle off the camera option next to the red button and then the circle will disappear.
If we understand your issue in the wrong way, please share us with more details about your issue so we can take a look and keep supporting you. Please don't hesitate to reach out to us if you're seeking for help.
Kind regards,
Hendrix-C – MSFT | Microsoft Community Support Specialist