How to Configure Huion Graphic tablet?

I bought a Huion H640P Graphics tablet, driver installation worked like a charm, but I am not able to configure lefthanded mode.

This his how i installed the driver:

sudo pacman -Syu $(pacman -Qsq "^linux" | grep "^linux[0-9]*[-rt]*$" | awk '{print $1"-headers"}' ORS=' ')
sudo pacman -S dkms
pamac build digimend-kernel-drivers-dkms-git

I then followed the digimend setup instructions but no matter what I do

cat /etc/X11/xorg.conf.d/50-tablet.conf
Section “InputClass”
Identifier “Graphics tablet pen”
MatchDriver “evdev”
MatchIsTablet “on”
MatchProduct “HUION Huion Tablet_H950P Pad”
MatchDevicePath “/dev/input/event*”
# Apply custom Options below.
Option “InvertX” “on”
Option “InvertY” “on”

I also tried the command

xinput set-prop "HUION Huion Tablet_H950P Pad" "Coordinate Transformation Matrix" -1, 0, 1, 0, -1, 1, 0, 0, 1

but it is not also having any effect.
What am I doing wrong?

You should not have

If that is not the actual product ID … In your case it might be: HUION Huion Tablet_H640P Pad but i doubt is a required detail to be included in conf.
See if this configuration will help

or try this one

Thank you for the hint.
I was Installing the xf86-input-wacom driver from AUR.
I can configure everything with the xsetwacom command now.

Not to hijack anything, but are you using xfce?

If not, would this work with xfce? Maybe @bogdancovaciu knows a thing or two?