So I successfully installed the driver on Windows desktop pc and the app on my Lenovo Tab tablet and it works perfect as a second extra monitor but how about the touchscreen on it?? can I use it somehow I don’t understand the instructions in the manual if there are any?
Touchscreen is already supported by spacedesk.
You can easily enable it on the viewer settings.
Please check the Configuration & Settings -> Viewer Device (Secondary Machine) chapter in the user manual for more details https://www.spacedesk.net/user-manual/.
By the way, is your Lenovo tablet Android? or Windows?