Windows 10: How to limit the maximum CPU resources for a specific process?

I searched Google and found this blog, but when I try to repeat the steps, I see that my contextual menu does not have the options to limit a process. I restarted Task Manager as administrator but it did not make any difference.

How can I limit Windows Defender? Bananas leave on occasion. I want it to continue working but that my computer does not work like a helicopter …