catia freestyle: control points don't work

Hi! I have just started to learn the freestyle module of CATIA v5, but I got stopped because of a issue I can't solve.
Basically, following the manual, I draw a planar patch, but after activating and moving the control points nothing happens, the planar patch remains planar.
Whay am I doing wrong?
Maybe is there an option or something I didn't activate?
Thanks!