By clicking this button on the toolbar you can open the dialog window



where you can define all the parameters for the polars you are going to draw.
Clicking 'Draw' this new document will appear:



here you can see the Cl(Cd) graph.
This documents has 3 pages, we can navigate among them by clicking the buttons

where the one relative to the current page is disabled.
Here is how you can see next pages:



Here are the polars Cl(alpha) and Cd(alpha)



and here Cl/Cd(alpha) and Cm(alpha).