The touch function work in the primary screen but not second screen.

Step 1: Setup the monitor in Extend mode.

-----Press WIN+P, choose Extend.

Step 2: Set the monitor as the touchscreen.

-----Open the Control Panel -----> All Control Panel Items ----> Tablet PC Settings or Pen and Touch ---->Display/Configure---->Setup---->Touch and choose the external monitor as the touchscreen


*If you don't know how to set up, you can follow this link: https://support.ctouch.eu/hc/en-us/articles/115003949829-How-can-I-setup-multiple-touch-screens-in-Windows-10-

  *If you cannot find the “Tablet PC Settings or Pen and Touch ” button, you can follow this link: https://answers.microsoft.com/en-us/windows/forum/windows8_1-hardware/tablet-pc-settings-is-missing/b55ab19d-ee5a-4973-84c5-39aabd723d31

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