Whether you need to enter a password to log in doesn't affect it. If the Welcome Screen is enabled but you only have one account and no password, it'll log in automatically but the Welcome Screen is still enabled. Same if you have the Welcome Screen enabled but you've set an automatic login through "control userpasswords2" or Tweak UI. You need to check the box for the Welcome Screen itself in Control Panel | User Accounts.

A standalone PC at home will be part of a workgroup. You can't be in a domain unless there's a copy of Windows Server on the network, and even then it's optional.