Its not that bad… 
It would be great if they solve the MIXER-“keycommands”, so it get recognized globally.
Its very odd and confusing that you need to activate the mixer-view with help of the mouse on example the second-“monitor”, to make it react on the specific keycommands?
Setup a new “option” and make a specific keycommand that make the “MIXER-view” scroll LEFT or RIGHT on all the mixer channels. That would be gold. 
Best Regards
Freddie