This is a fairly old post, but I got here on a similar issue. I am learning a new Chuwi Hi12 keyboard and suddenly the touchpad no longer worked. Realizing that everything else worked I assumed that by trying various fn keys I must have disabled the touchpad.
In case anyone else gets here still not knowing what happened, on the Hi12 keyboard the touchpad toggle is on the f11 key…. .: pressing fn and f11 will switch the touchpad off or on. I’d expect a similar switch is on the vi10 and some (Pipo W3F for one) have a dedicated touchpad toggle button on the keyboard.