How to hide scenes?

Scene activeScene = SceneManager.GetActiveScene();

GameObject temp = new GameObject( "stageTempGO" );

GameObject[] allObjects = activeScene.GetRootGameObjects();

foreach (GameObject go in allObjects) {

　go.transform.SetParent( temp.transform, false );

}

AsyncOperation async = SceneManager.LoadSceneAsync( "Battle", LoadSceneMode.Additive );

while (!async.isDone) {

　yield return new WaitForEndOfFrame();

}

Scene battleScene = SceneManager.GetSceneByName( "Battle" );

SceneManager.MoveGameObjectToScene( xyz...etc, battleScene );

SceneManager.SetActiveScene( battleScene );

temp.SetActive( false );