Include these groups in the list of users:
When configured to display a list of users the login screen can be set to show Administrator users, Local users, Network users and/or users with ID below 500. The "Users with ID below 500" option allows creation of hidden user accounts by changing the user's ID (in the Users & Groups preferences pane, right-click on the user you want to change and choose "Advanced Options…") to a number below 500. It can also be set to display a "Other…" (users) button.
Hide Buttons:
Cocktail can hide the sleep, restart and shut down buttons at the login screen.
Display additional message:
macOS's login screen can be set to display additional information.
Display password hint after:
The number of failed login attempts before the password hint is shown.