no..the mixer window was not in earlier versions.
I wonder though if bringing the master volume waaaay down...like 10dB or more is not the thing to do though, but the individual tracks ought to balance out better. I only say this in comparision to an analog board. I have always tried to leave the master a OdB, and would only occasionally tweak it while monitoring if I was clipping too much OR if the track count was truely excessive and complex. I wish you could Select/Shift and do multiple fadars like other functions...like the solo, mute, etc. .....to get more than one going at a time. Kinda supprised it was actually not available, as stuff like moving tracks and other stuff is mandatory, imo. Maybe the master volume is a fake! I don't know where to find out about it. They don't say diddly about it in the "help", other than to say it is handy.