add these two lines under [SeatDefaults] in /etc/lightdm/lightdm.conf.d/90.nvidia.conf
greeter-hide-users=true
greeter-show-manual-login=true
add these two lines under [SeatDefaults] in /etc/lightdm/lightdm.conf.d/90.nvidia.conf
greeter-hide-users=true
greeter-show-manual-login=true