Am I stuck with the username I have on this computer?

[Guest Private&Private]

Hello,I bought a new Win11 computer the other day. When first powering it on, it required me to give it an email address to be logged into. As I didn't know why that was necessary, I gave it an extra email address that I never use, happened to be *** Email address is removed for privacy ***. (I'm using a fake address here.)So, I see that email address presented on this screen when I go look at Settings. Why, I don't know. I never use that address, it's meaningless to me.Well, ok, whatever. But now I notice that whenever I do WINDOWS-R to get the Run screen and then do cmd, I get a box that presents as follows:C

 

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