Well not a problem with the master section, more a problem of me not being able to work out what I have a feeling is going to be very obvious.
I started a montgage with an 8 channel master section then quickly realised what I was wanting to achieve was not possible, so I set about changing the master section back to 2 channel.
How is this done? I just cant see it, I though it would revert to two when I disabled 6 of the 8 outputs but no. It’s doing no harm except cluttering up my workspace with all the extra metering etc that no longer needed.