Stack section question re: Cabs

Forgive me but I am a novice here. If I select a rig the cab button does not light up. Does this mean that it is the complete rig or has the cab component been switched of? Given that the previous user used the Kemper with a powered Cab. The manual does not seem to be completely clear on this point.

I think that I have solved the problem. The Lock button was on and had the effect of turning off the cabs. Sorry about that!!!