bigben3333Thanks for your solution and the problems you posted..
Just after 3 hours looking for the solution, i wanted to share with you how i solved that problem.
My screenpad plus was not working properly when i used the touch function.
The action of selecting a desktop icon was not possible directly by touching but only by going down with the mouse with the touchpad.
First, starting from MyAsus app, i tried to reinstall graphic drivers, then i reinstalled ScreenXpert driver, then ScreenXpert from windows store but nothing worked.
Then i saw that there was a "Screenpad Plus Optimizer" entry in Utilitary.
I tried to download and launched it : ASUSScreenPad2Optimizer_V1003.zip
It tooks around one minute blinking and testing my screens, then i rebooted.
Finally I can select directly elements on the second screen and use apps like handwriting 🙂
Maybe there are other solutions, but this one worked for me.
Hope it help.
UX581 - Screenpad plus touch behavior is like touchpad instead of a mouse