code: private void obtainBreadcrumbElevation() {
          int elevation;
  
          try {
              elevation = ThemeUtil.getDimensionPixelSize(this, R.attr.breadCrumbElevation);
          } catch (NotFoundException e) {
              elevation = getResources().getDimensionPixelSize(R.dimen.bread_crumb_toolbar_elevation);
          }
  
          setBreadCrumbElevation(pixelsToDp(this, elevation));
      }
docs: Obtains the elevation of the toolbar, which is used to show the bread crumb of the currently
  selected preference fragment, when using the split screen layout.