Catalina - Configure Login Window to Prompt for Username and Password
The login window _MUST_ be configured to prompt all users for both a username and a password. By default, the system displays a list of known users on the login window, which can make it easier for a malicious user to gain access to someone else's account. Requiring users to type in both their username and password mitigates the risk of unauthorized users gaining access to the information system.
This is implemented by a Configuration Profile. mobileconfig profile info: com.apple.loginwindow: SHOWFULLNAME: True