I don't know if i miss anything but i can't change the expression of the girl. No matter what I choose she doesn't change her face expression.
Strange on my end it works, maybe you play on low graphics settings? And this is a way unreal tries to save performance.
Do I just have to select the expression in the top left corner or do I have to activate it somehow?
Expression on the top left should be enough. There is nothing to activate.