For security reasons, you may want to consider renaming the built-in local Administrator account. This account is very powerful, and its name is easily guessable so it is a common vector for attackers. Before you rename this account, make sure you understand the consequences:
To rename the built-in Administrator account (or any other local account), launch PowerShell with Administrator privileges, and run this line:
PS> Rename-LocalUser -Name "Administrator" -NewName "TobiasA"
To use the account for login, use the newly assigned name. By using the account’s well-known SID, you can still identify the renamed account even if you don’t know its name:
PS> Get-Localuser | Where-Object Sid -like 'S-1-5-*-500'
Name Enabled Description
---- ------- -----------
TobiasA False Built-in account for administering the computer/domain
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