Zooming In Vertically in Effect Controls

Hi.

I just noticed that we can adjust the Ease In / Ease Out curves with a bezier in the Effects Control panel. However, I've been trying to zoom in vertically and I can't seem to find a way. I have no problem zooming in horizontally, but not vertically. And the height we have to adjust the curve is not enough. 

Is there a way to zoom in vertically?

Thanks