question: private void showPreloadingStage ( ) { Stage preloadingStage = new Stage ( StageStyle . UNDECORATED ) ; preloadingStage . initOwner ( primaryStage ) ; preloadingStage . setScene ( new PreloadingScene ( ) ) ; preloadingStage . show ( ) ; primaryStage . setOnShowing ( null ) ; }
target:  Shows preloading stage with scene while FXGL is being configured.