sudo pacman -S kcm-wacomtablet
That will install also the xf86-input-wacom
But probably you did that already.
You don’t have to edit anything, nor move files around, but you have to unplug and plug back the tablet after boot/reboot. Simply since the 5.2 kernel the tablet even tho recognized is not working at first, only if is reconnected once the user reaches the Desktop.
In Settings you will have then the ability to set things up under Input Devices:
Do not mix those settings with xsetwacom commands, and do not use the Wacom tablet finder as it will render useless the:
~/.config/wacomtablet-kderc
and
~/.config/tabletprofilesrc
and you need to delete them and start over in Settings …