In order to edit a data template you can either go to the Resources tab (Ctrl+5) and click the pencil icon This was the key piece of information. Thanks Suggestion for improvement: By default the Studio renders the Resource files likes this. Looks "kinda unsupported/empty", thus my percep...

TLDR: I'm trying to find a way to split up XAMLs that will work both in Noesis Studio and Runtime. Premises: Have a game HUD with distinct sections/modules. Each section should have its own VM (cpp) and View (XAML). Assume 1 View for main HUD and 1 sub-View for list of Pawns in Scene, for example. ...