I¨m afraid you’re wrong. What your arrow is pointing at the the Control Room Activation button. Deactivate it and your have no Control Room at all. It does not give you an extra Control Room.
Of cause you can activate a second mixer, if you care to have your screens littered with mixers. I don’t. Then it’s a much better idea to invest in a third-party meter, or use Steinbergs free SLM128 plug-in.
What was pointing at was that showing the wrong part of the loudness meter, makes it useless. Anyone who thinks that the numbers beneath the bargraph are unimportant haven’t got the faintest notion what loudness metering is about.
Those who continue to rely on peak metering, and squashing their mixes in the belief that they sound better (louder) are setting themselves up for bitter disappointment. The entire broadcast industry and most of radio and Internet streaming outlets have adopted the EBU R128 Standards (EUR) and the ATSC A185 Standard (US).
While Peak metering measures peaks (as the name suggests), Loudness metering measures loudness over time. This means that the bargraph is of little consequence. What is important are the LU/LUFS values and True Peak values that are hidden in Steinbergs implementation of the combined Control Room/Metering view. That is what renders Steinbergs implementation useless!