code: private void adaptBreadCrumbVisibility(final boolean hideBreadCrumb) {
          if (isSplitScreen()) {
              if (breadCrumbToolbar != null && breadCrumbShadowView != null) {
                  breadCrumbToolbar.setVisibility(hideBreadCrumb ? View.GONE : View.VISIBLE);
                  breadCrumbShadowView.setVisibility(hideBreadCrumb ? View.GONE : View.VISIBLE);
              }
          } else {
              if (toolbar != null && toolbarShadowView != null) {
                  toolbar.setVisibility(hideBreadCrumb ? View.GONE : View.VISIBLE);
                  toolbarShadowView.setVisibility(hideBreadCrumb ? View.GONE : View.VISIBLE);
              }
          }
      }
docs: Adapts the visibility of the toolbar, which is used to show the breadcrumb of the currently
  selected navigation preference.
  
  @param hideBreadCrumb
  True, if the toolbar, which is used to show the bread crumb of the currently selected
  navigation preference, should be hidden, false otherwise