plasma desktop

Install the plasma-meta meta-package or the plasma group. Alternatively, for a more minimal Plasma installation, install the plasma-desktop package.

sddm

The Simple Desktop Display Manager (SDDM) is the preferred display manager for KDE Plasma desktop.

• Install sddm

pacman -S sddm

• Configuration
  
  SDDM defaults to using systemd-logind for session management.

sddm --example-config > /etc/sddm.conf

• Loading sddm

systemctl start sddm

systemctl enable sddm