Oh okay. Such a pity.
Well Reaper solved this perfectly. It works basically like Cubase IC Pro (a web server) on which you access by using a browser (doesn’t matter if Android/Pc/OS). On login you select which CUE mix is yours and then only tracks which are sent to your CUE mix will be displayed. Then you can mute them or change the volume.
This way the artist can concentrate on a limited number of tracks without being distracted by all the (audio) tracks you have in your project.
Also the artist has only access to the CUE mix and cannot see or change other stuff.
Hopefully Steinberg realizes what a gamechanger this could be for studios.