The Overview Frame is opened when a dataset is loaded into VanGogh. It is giving an overview about the currently visible area of any plot.
The next display shows the result of a scrolling and zooming operation performed in a Flow Diagram:
It is not clear, which area of the original display is displayed at this moment. Therefore the Overview Frame gives an idea about the visible area:
Clicking or dragging in the Overview Frame results in an equal panning operation in the selected plot.