I wanted to know if i just set the touch interface options to “Always Show Touch Interface” will that be enough to make touch interface work after I have exported the game to a windows platform having touch enabled?
Due to the large volume of questions and comments concerning the Engine, we did not have a chance to respond to your post at the time you submitted it. However, if you are still interested, the following documentation contains useful information on Input for UE4.
If you are referring to a Windows PC or Windows surface with a touch screen, yes, this will work. (*Note: you will need to check the Show Engine Content checkbox in the object picker View Options settings to see these.)
The Windows Phone, however, is not supported.