I'm trying to send tracks to groups, but the tracks that I send there still show up on the mixer. I have clicked "Hide Minimized tracks" but nothing happens. Any ideas?
For 'Hide Minimized Tracks' to work, you have to.. well.. minimize the tracks. Just sending the output to a group doesn't do it.
Look for a very small button at the upper-left of the track title (on the Timeline). Click the button to minimize the track, and it should disappear from the Mixer.