Restrict graphic tablet to primary display

I have a Huion DWH69 graphic tablet with Manjaro Linux installed. I have two displays connected. It seems like to work out of the box, but the problem is that I want to bound the surface to the limits of the primary monitor. At the moment, the horizontal movements are very fast since it is a small tablet but a huge area of display. How can I configure that? I guess I have to touch the X-Server in some way, but I don't know how.