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:



where 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).