bbat64

I am trying to figure out a way to view multi sites full screen. we use Centerv2 and there is no way to go fullscreen. I have installed mulitview and added all 4 location when 1 location is select we are able to go into fullscreen. but if wee add cameras from other locations the fullscreen button greys out and is unselectable. Can anyone help me figure this out or tell me another software to view 4 locations fullscreen