Oh, you don’t want to go to school or watch news?
You want to get it from a place like this?
Very well.
First off, we have isolated and observed the virus in infected individuals. Isolation is not the same thing as containment which means the virus can no longer thrive.
Second, viruses don’t need to be isolated to mutate but rather to observe the mutation.
Because you believed some, probably dead, idiot on the internet who thought they knew what they were talking about, doesn’t mean YOU know what you’re talking about. Which is why people who do are wondering why you think viruses mutate in isolation rather than when they’re allowed to run rampant.
I’m also happy to provide links if you like.