Cockpit/instrument panel darkens

[len94s]

New to x-plane.......When the mouse is at the top of the screen and the menu bar is in view, the cockpit and instrument panel is bright as you would expect it to look on a normal daytime flight.  As soon as I move the mouse into the cockpit, the screen darkens as if I was flying at night.  How do I keep this from happening?

 

Thanks for your help!

Edited October 25, 2015 by len94s