Using Cubase 11.0.30 on Mac OS 10.15.7,…all good except for the life of me I cannot seem to find the global tracks in the key editor. I’ve followed the manual and on my rig when I go to “Set up Window Layout” there are no options to select “Global Tracks”,…yes, Global tracks exist in the project.
That, or, depending on what you actually saw in that video, maybe they were using the “Divide Track List” function. That way you can manage yourself which tracks you want to always glue to the top (of the main project window, not the lower zone). I often use this function for sticking stuff like tempo tracks and markers to the top.