I don't think it was made by design, but when I add a "Follow" action as a task inside a Behavior tree, I can't assign a Gameobject as a target. However, when I add the "Follow" action outside this tool, everything is working normally, I can put all the Gameobjects I want.
(Well done by the way for this Behavior asset. I just bought it today, and you made things easy for us, so great)
Customer support service by UserEcho