MAC Safari message 13 Viruses Detected? from volemist.co- How to stop this?

Based on the fact that the message is appearing in the upper right hand corner of your screen, I suspect that it is a Web notification.

Please see

Stop unwanted Notifications - Apple Community

for how to block these in Safari.

If you are using any other browsers, block them in those browsers, too. The controls will be different, but the idea will be the same.

Messages like this are called malware. They are benign but also annoying. There are apps available which can remove malware. Malware bytes is one, but they now only offer the cost version. I have found that there are now new free apps which also remove malware. Get one and run it and it will solve your problem.

+1 on using Malwarebytes, do NOT download any third party:

• Antivirus apps
• Cleaning apps
• Security apps
• VPN apps
• Maintenance apps