Started playing last night, and I love it. I noticed that when I ctrl + click on a unit, the screen seems to lock on the unit and center. Super. Now, how do I "undo" the lock on that unit. Doesn't seem to help if I just lick on another unit? My solution is to hit F1 (or whatever) for my engineers. But that seems like a lame way to unlock. Seems like I should be able to unlock the centering with a click.... Just can't quite figure it out.