it took me a while to figure it out - basically the mute/solos are fixed at the bottom instead of the fader/mute/solo as it is now (when you detach the mixer).
I would probably still prefer the current setup which looks like this:
The current approach still puts the mute/solos below the scrolling mixer (but below the panner) almost exactly as devilfish does in the second drawing, and
you can still see the channel and master faders and meters (which is the part I prefer). :-)