Correct me if I’m wrong, but it would seem that in order to link channels, you have to open up the mixer window, select the channels, right click and select “link channels”.
What I don’t understand is why you can’t just do that directly from the track listing in the main project window? Why can’t you simply select the tracks you want to link, right click, and select “link channels”? Why do you need to open up the mixer window.