It is! And what the production designers put on screens is part of what communicates with the audience. Maybe the audience needs to get specific information from the UI in order to understand something in the story. Maybe the audience needs to understand that the talent is having a certain kind of interaction that gives them a particular kind of information, or allows them to control something. In all those cases, the UI is part of how the creative team tells the viewer what's going on in the world of the film!