This questions has been ask before over two years ago. There are yet no answers. It is a simple question, does the Mathematica notebook interface support touch? If it does how do you use settings to get it to work? It appears to work for me on some Notebooks, but not on others. On those for which it works I can scroll up and down and sideways. However, I have not been able to figure out why it works on only some Notebooks.
Regarding Mathematica for macOS, I haven't encountered any problems about touch screen. It works fine. I use an iPad as an external display, so I can use touch screen of the iPad to scroll Mathematica notebooks on iPad.
I haven't never used iPad as external display on Windows, fortunately Duet Display supports Windows as well.