Start menu behaviour

Before when I moved the mouse over folders the sub-menu would unfold automaticly

I read somme tip that I coud change that behaviour to having to click the folder to see the sub-menu
so I tried It some time ago and now I would like to return to the old behaviour.

The problem is that i cant find the note I made my self, and I do not remenber how i did it.

Does somebody know.
please help..

thanks, Guy