Open your registry and find the key below. 

Create a new DWORD value with the exact same name as the user account you wish to remove and set it to "0" to remove the account from the logon screen

Restart Windows for the change to take effect. 

Key:[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\
       CurrentVersion\Winlogon\SpecialAccounts\UserList\]
Value Name: USERNAME
Data Type: REG_DWORD
Data:(0 = disable, 1 = enable)

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