disable hot corner?

[Nguyen Thai Ngoc Duy <pclouds gmail com>]

Hi,

In my desk, my mouse is between my and my keyboard and I move the
mouse accidentally touching the hot corner too often. Is there any way
to disable the hot corner? I primarily use Windows key to activate
overview mode, or if I need to use mouse, I can always click on
Activities button.
-- 
Duy