If one of your intentions (active node) is part of the dialogue flow when you go into edit it, you will see the entire diagram of the dialogue flow. The intention you are editing will appear in lilac and the rest of the flow in grey.
In the diagram, you will see 2 levels of questions (nodes) forward and backward (where applicable) with arrows showing the exact direction of the flow.
To make the navigation easier you will find zoom in and out buttons and the possibility to see the entire screen.
To exit the full-screen press "Esc".
To find out how to create a dialogue read the following article: