mbp-manjaro/community/lxqt/desktop-overlay/etc/X11/xorg.conf.d/50-synaptics.conf

Section "InputClass"
        Identifier "touchpad catchall"
        Driver "synaptics"
        MatchIsTouchpad "on"
              Option "TapButton1" "1"
              Option "TapButton2" "2"
              Option "TapButton3" "3"
EndSection