code: function _shouldAnimateFromLeft() {
                  if (_WinRT.Windows.UI.ApplicationSettings.SettingsEdgeLocation) {
                      var appSettings = _WinRT.Windows.UI.ApplicationSettings;
                      return (appSettings.SettingsPane.edge === appSettings.SettingsEdgeLocation.left);
                  } else {
                      return false;
                  }
              }
docs: Determine if the settings pane (system language) is RTL or not.