Simple Eagle Tree question?

Hi guys,

Im owning my Eagle Tree for a few days now, but I have a tiny little problem. I've got recorded a 13+ minute run but it only shows the first minute of it. So I have to scroll to the right. But how can I zoom out? I know how to zoom in, and after that out, but if I see one minute of the graph it can't zoom out any more?

Thanks,

Patrick