frankgio wrote:
System Settings has identified several viruses on my MacBook Air, 2019 model).
No it didn't. What you are seeing is not arising from system settings. It is a lie.
It is a lie, but it is annoying. Stop the annoyance 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
If you bought or installed something in response to the lie, return it and get your money back. Do not install anything. If you did already, uninstall it immediately. Rule 1 of Macs is don't install junk.