Basicall I have installed a few desktop environments. And if you are familiar with Unity, you know that the way switching works, is you get this sort of drop-down with all the environments installed, you then high-light the desired option and click "ok". So my problem is that I have quite a few installed, and OK button is outside of the screen, and I cannot find any way to scroll down? So in turn, I cannot switch my DE as a result.. any way around this?