LIGHTDM
Check which dispaly manager is running.
systemctl status display-manager
or
systemctl show display-manager --property=Id
or
grep 'ExecStart=' /etc/systemd/system/display-manager.service
Config files.
micro /etc/lightdm/lightdm.conf
micro /etc/lightdm/lightdm-gtk-greeter.conf
SLICK GREETER
micro /etc/lightdm/slick-greeter.conf
GUI
yay -S lightdm-settings
START
sudo lightdm-settings
INSTALL SLICK GREETER
sudo pacman -S lightdm-slick-greeter