code: private void showBreadCrumb(@Nullable final CharSequence breadCrumbTitle) {
          CharSequence formattedBreadCrumbTitle = formatBreadCrumbTitle(breadCrumbTitle);
  
          if (isSplitScreen()) {
              breadCrumbToolbar.setTitle(formattedBreadCrumbTitle);
          } else if (!TextUtils.isEmpty(formattedBreadCrumbTitle)) {
              showTitle(formattedBreadCrumbTitle);
          }
      }
docs: Shows a specific bread crumb. When using the split screen layout, the bread crumb is shown
  above the currently shown preference fragment, otherwise the bread crumb is shown as the
  toolbar title.
  
  @param breadCrumbTitle
  The bread crumb title, which should be shown, as an instance of the type {@link
  CharSequence} or null, if no bread crumb should be shown