The structure map is visible in the right portion of the window.
The structure map displays the parts in a structure with different levels and a color symbol. The color symbol indicates the part type of each respective part. The symbols are explained at the bottom of the Search Form. If there are higher levels in the structure map, you can maximize/minimize by double-clicking on a row or by selecting/deselecting the Maximized option.
You can also view additional information about the parts in the structure map by right-clicking to open the Info menu.