                 savedArticlesViewController.editController.navigationDelegate = nil
                 removeChild(savedArticlesViewController)
                 addChild(readingListsViewController)
-                leftButtonType = .add
                 scrollView = readingListsViewController?.collectionView
                 isSearchBarHidden = true
                 activeEditableCollection = readingListsViewController

                savedArticlesViewController.editController.navigationDelegate = self
                readingListsViewController?.editController.navigationDelegate = nil
                savedDelegate = savedArticlesViewController
                leftButtonType = .none
                isSearchBarHidden = isSavedArticlesEmpty
                scrollView = savedArticlesViewController.collectionView
                activeEditableCollection = savedArticlesViewController

    
    private var isSavedArticlesEmpty: Bool {
        return savedArticlesViewController.editController.isCollectionViewEmpty
    }

    private var isSearchBarHidden: Bool = false {
