mkdir -vp /etc/X11/xorg.conf.d

cat << EOF > /etc/X11/xorg.conf.d/99-touchpad.conf
Section "InputClass"
	Identifier "my-touchpad-1"
	MatchIsTouchpad "on"
	Option "Tapping" "on"
	Option "TapButton1" "1"
	Option "TapButton2" "3"
	Option "TapButton3" "2"
	Option "DisableWhileTyping" "1"
	Option "NaturalScrolling" "True"
EndSection
EOF

• https://wiki.archlinux.org/title/Touchpad_Synaptics