Long story short.
Try this!
\
- Go to Mixer-page “Top Right!”
- You see a arrow down. (Functions Menu")
- In “Functions Menu”, down end of the list you find something called “Link Mix-consoles”
- Activate it!
Done…
You can also save the mixer settings on “Top Left” “Channel and Rack Configuration Functions”.
Hope it help! 
Best Regards
Freddie