Make Music it is time you update the atrocious mixer. It isn't a big deal to expand the window so at least it shows all your instruments is it?
And, what in the world is that little triangle arrow thingy to expand it? Do you guys even use Finale and you thought that was good? Geeze, c'mom on guys. The smoothness of the screen has a lot to be desired instead of chucky blinking. If the other notation software can do so can MM.