code: private void addTopLeftLabel() {
          topLeftLabel = new JLabel();
          topLeftLabel.setOpaque(true);
          topLeftLabel.setVisible(false);
          centerPanel.add(topLeftLabel, CC.xywh(
              constantTopLeftLabelCell.x, constantTopLeftLabelCell.y, 1, 3));
      }
docs: addTopLeftLabel, This adds the top left label to the center panel.
  
  This function should not depend on any settings variables.