how to turn on touchpad tapping in KDE plasma? | touchpad is not working kde plasma linux !

sudo apt install xinput

xinput list

xinput set-prop device id "libinput Tapping Enabled" 1

sudo mkdir -p /etc/X11/xorg.conf.d

sudo nano /etc/X11/xorg.conf.d/30-touchpad.conf

Section "InputClass"
Identifier "touchpad"
MatchIsTouchpad "on"
Driver "libinput"
Option "Tapping" "on"
EndSection