How to stop McAfee pops up?

Are those popups appearing in the upper right corner of your Display?

Those are Safari Notifications. Stop them by following these instructions.

• Go to Safari's Preferences... menu > Websites > Notifications, and remove everything there.

For reference: Change Websites settings in Safari on Mac - Apple Support

Don't allow websites to send you Notifications unless you are 100% certain that you want that kind of harassment. Refer to Customize website notifications in Safari on Mac - Apple Support.

Related: How do I stop mcAfee fake renewal notification from popping up? - Apple Community

Hi there,

Make sure there’s not McAfee installed on your MacBook:

-> Search for McAfee app on your Mac, and uninstall it if necessary: Uninstall apps on your Mac - Apple Support

-> Check out the McAfee support article: https://www.mcafee.com/support/?articleId=TS101226&page=shell&shell=article-view

If the issue persists, please contact McAfee support

Thank you so much, those popups were so annoying, I had never got anything like that on Mac before.