The Top Meteo panel on the left will give you the possibility to display.
Wind flags are static and also show wind strength in knots (see also Wikipedia). The flags represent the wind at a certain altitude which you can select in the "Wind [kts]" section.
Wind field animation
The wind animation follows the trajectories of the forecasted wind at a given altitude. This altitude is selected through the "Wind [kts]" section same as for the wind flags above. The trails are black with the vector map background and white on Satellite images to provide enough contrast to be seen easily.
When Convection height checkbox is enabled numbers are superimposed on the map. The numbers represent the maximum usable mean sea level top of convection for a given area during the day. Top of convection is either the top of useful blue thermal or cumulus cloud base.
15 = 1500m
22 = 2200m
46 = 4600m
015 = 1500ft
095 = 9500ft
145 = 14.500ft
Potential Flight distance
This layer colours the map with potential flight distance colours (elsewhere you may find an abbreviation PFD for this parameter). There is a legend on the right-hand side to tell you what the colour represent. Red is good. Always try to plan your flight such in the red as much as possible.
You can choose which glider type is used for the PFD calculation at the bottom of the Top Meteo panel:
Here's how the whole SeeYou window with Top Meteo panel and overlays looks like. You can read more about flight planning with Top Meteo weather overlay here.