Information
The login window prompts a user for his/her credentials, verifies their authorization level and then allows or denies the user access to the system. Prompting the user to enter both their username and password makes it twice as hard for unauthorized users to gain access to the system since they must discover two attributes.
Solution
Perform the following to implement the prescribed state: Open System Preferences Select Users and Groups Select Login Options Select Name and Password Alternatively: Run the following command in Terminal: sudo defaults write /Library/Preferences/com.apple.loginwindow SHOWFULLNAME -bool yes