How to make Windows display local account name instead linked Microsoft account full name?

[Microsoft Windows]

When I installed Windows, I did it without network connection to ensure that it sets up my account as local account. That went smoothly, local account was created with the account name "Alex". Windows created "Alex" folder in C:\Users. Everything as I wanted. Then I wanted to link my Microsoft account. I went to Settings > Accounts > Your info and signed in with my Microsoft account. That part went well too. Now my problem is that Windows shows full name that it reads from my Microsoft account on the login screen, lock screen, on start overlay. Instead, I would like it to display

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