# rotate boot and console
sudo nano /etc/default/grub
GRUB_CMDLINE_LINUX="video=eDP-1:panel_orientation=right_side_up"

# rotate SDDM on X (on login)
sudo nano /usr/share/sddm/scripts/Xsetup
xrandr --output eDP-1 --rotate right

# font
sudo dpkg-reconfigure console-setup
UTF-8 > latin1 et latin5 > Terminus > 14x28 ou 16x32