How to control wind for vegetation foilage in city park example

Hi there,
I’m trying to understand how to control the wind strenght in the City Park Example (UE5.2).
When I browse the tree in the content browser, I cannot find the wind parameter.
I tried to add a “wind directional source” actor in the scen, but it has no effect .
Could you please help me to understand how it works?
Thanks a lot !