Input Monitoring question

As we all know, the little blue "input monitoring" button is what you click to hear what you're playing in real time.  A regular audio track, like guitar or bass, is fine.  No problem.  Sometimes, if I have multiple soft synths in a project, when I play my MIDI controller, I'll hear various soft synths even though the input monitoring button is only clicked on one of the synths.  For example, I'll have Rapture BLUE because I wanna hear a pad, but I'll hear Addictive Drums.  Both sounds happen at the same time. 
 
How does one stop this?  I've been meaning to ask this for years. 

Ok, thanks.  I guess I'll just turn this into the "dumb ass misc question thread."  Sometimes I hit a button (I don't even know which one) that "shrinks" the "size" of every single track.  I have mine open so I can see all the volumes and panning.  I hit this certain button and it makes the track so you don't see anything except maybe the name of the track.  I don't really know how else to explain it.  Is it possible to undo this right after it happens?

I think there's a "Fit All" or similar bound to either the "F" key or some combo.