A right click on an object in the "Calls" tree or "Called By" tree activates it in the project tree and displays its dependences.
One imagines a project in the form of many call chains that all begin far to the left and ends far to the right, then this view displays a section of this concatenation and the right click displaces it after the left or after the right.
With that the navigation possibilities of this view are clarified, because with their aid you can go from the main procedure to in the last corners of the project and back. And that at simultaneous consideration of the code!