I'm able to manipulate/hide the titlebar in UWP apps for desktops with code from this answer:
ApplicationViewTitleBar formattableTitleBar = ApplicationView.GetForCurrentView().TitleBar;
formattableTitleBar.ButtonBackgroundColor = Colors.Transparent;
CoreApplicationViewTitleBar coreTitleBar = CoreApplication.GetCurrentView().TitleBar;
coreTitleBar.ExtendViewIntoTitleBar = true;
but it doesn't work for the Hololens environment. I've searched the documentation but cannot seem to find a workaround. Is this possible?