Enable Touchpad tap to click on Archlinux
In order to activate "Tap to click" and "Double tap to middle", edit "/etc/X11/xorg.conf.d/30-touchpad.conf"
Section "InputClass" Identifier "touchpad" Driver "libinput" MatchIsTouchpad "on" Option "Tapping" "on" Option "TappingButtonMap" "lmr" Option "NaturalScrolling" "true" EndSection