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Hello Juliana N ! My name is Jeremy and I’m happy to help you with your question.
You will need to delete the credentials in order to use your new account as the default account and to remove the other one.
Here is how to delete the credentials on your computer, this will only delete the login licenses.
"Credential Manager lets you view and delete your saved credentials for signing in to websites, connected applications, and networks.
To open Credential Manager, type credential manager in the search box on the taskbar and select Credential Manager Control panel.
Select Web Credentials or Windows Credentials to access the credentials you want to manage."
SOURCE: https://support.microsoft.com/help/1b5c916a-6a16-889f-8581-fc16e8165ac0
Thank you for reaching out to the community forums, I hope you have a good rest of your day.
Regards,