The catalog allows you to navigate the tree of the categories. You will see a navigation bar at the top, which will show you the current category you are in. You may click the category names in the navigation bar to quickly jump up the tree. You may also use the ‘Up' button (yellow folder with a green up arrow icon) in the toolbar to go one category up, or the ‘Home' button (house icon) to go all the way up to Home – the root category. To go deeper in the tree, simply click on the desired category.