I used the code below to change a scene into a Scene View (launched by a button in a UI Menu), and it seems that the game scene is zoomed in. It also cuts off the scene and does not fill the entire screen.
w, h = ui.get_screen_size()
root_view = ui.View('menu')
scene_view = scene.SceneView()
scene_view.frame = (0, 0, w, h)
scene_view.scene = Game()

