It will automatically hide system users (UID < 1000)

To hide ordinary users from the login list create or edit a file named after the user to hide in /var/lib/AccountsService/users/ to contain at least:

/var/lib/AccountService/users/username

[User]
SystemAccount=true

/etc/dconf/db/gdm.d/01-login-screen 파일 생성

[org/gnome/login-screen]

disable-user-list=true

gdm DB 업데이트

rm /etc/dconf/db/gdm

dconf update