With T3 for Bootstrap 3, is it possible to hide or display menu items from the megamenu and responsive menu if the viewport is desktop, phone, etc?
BS3's helper classes like hidden-desktop and display-mobile should allow this, but they have no effect when used in the extra class field for the megamenu settings. In fact, using hidden-desktop as an extra class will make the item disappear forever in the megamenu admin interface. (I've posted that bug at github.)