You can try out this Experimental feature, but we do not recommend shipping projects with it.
Features are sometimes made available in an Experimental state so you can try them out, provide feedback, and see what we are planning. We do not recommend shipping projects with Experimental features. Please keep in mind that we do not guarantee backward compatibility for assets created at the experimental stage, the APIs for these features are subject to change, and we may remove entire Experimental features or specific functionality at our discretion.
Unreal Stage App
An application designed to utilize a tablet as a wireless control panel for specific Unreal Engine features in a physical space.
This feature has yet to be added to the Unreal Documentation. Epic Staff have added content about this feature on the Epic Games Community portal here: Unreal Stage App.