Often enough, I hit the "F" keyboard instead of the "G" (shortcut), which i use all the time.  I finally figured out what I was doing :-)  The results are not pretty.
 
Is there an undue last screen layout command or an undue "F".  Sure I can un-assign the "F" key.  But then I'll hit the "H" :-)
-rich

View Undo (zoom)
ALT+Z
 
I believe this undo your last view / also holding down the left mouse button while clicking the right mouse button at the same time undo a zoom view and possibly a fit all tracks to view, which is what your doing when you hit "F".

If you mean the tracks in the track view expand then you can hit CTRL+(up arrow) and they will collapse back.
 
I never knew the solution Charlie suggested. I'll have to make a mental note of it and try it the next time I encounter the same thing.

Hitting F instead of G

 
That makes the song sound soooooooo wrong.
 
I know form experience.

bapu
That makes the song sound soooooooo wrong.

You should hear an Alt-Z! :-)

All you need to do is go into the preference menu and change the Keybinds for one of them
 
CJ

xxrich
Often enough, I hit the "F" keyboard instead of the "G" (shortcut), which i use all the time.  I finally figured out what I was doing :-)  The results are not pretty.

Simple solution: change key.
 
(sorry; couldn't resist)