The Draw button allows the user to plot the selected type of plot. This button is enabled only after the data have been analysed. As a result, if you have selected to draw a classic wind rose in the options, the WindRose PRO screen will appears like the following one.

You can also select to plot the raw data or the "spaghetti" (rays) plots.
You can also select to plot the average value (and/or the minimum and the maximum) for each direction, and the WindRose PRO screen will appear like the following one.