Touchpad options in xorg.conf.d ignored


I have a pinebook pro running manjaro-arm i3 edition. The touchpad is too sensitive, and I can’t control it accurately. I try to turn it down by editing the following in /etc/X11/xorg.conf.d/30-touchpad.conf

Section "InputClass"
    Identifier "touchpad"
    Driver "libinput"
    MatchIsTouchpad "on"
    Option "Tapping" "on"
    Option "AccelSpeed" "0.0" # <-- I set this 

Weirdly, this changes the touchpad speed but only on the greeter. Once I’m logged into my i3 session, the touchpad goes back to the original speed. I am unable to find which piece of configuration is changing this on login. Anyone got any ideas to help me out?

Much appreciated,

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I installed the sway version on my pinebook pro and I don’t even have that configuration file on the system.
Not sure if I should create the file but I don’t even know where to begin searching for a default file that is adequate for the pinebook pro.