Yes you can, just highlight all the tracks you want to re- size. Drag one of the track to the size you want plus hold down the shift KEY !!!

Amazed

Each of these should apply appropriately to multi-selected tracks. Level 1 would then expand the selected tracks and collapse the others. In order to expand all tracks, just Ctrl+A first to select all tracks.

Personally, I don't like the idea of ctrl a for select all tracks. It means that clip selections I have at that point would be lost. Perhaps another command for select all tracks. ? ............

Ctrl + a for select all has been a feature of SONAR since at least 6PE so any change would be totally unwelcome here.
Also, many Windows based programs use the same protocol - Word, Excel, Outlook etc 
 
But, any time you make a track selection you lose clip selection anyway, so I don't really understand your point. 

Bristol_Jonesey
 I don't really understand your point. 

Freddy Mercury said it best, "I want it all, and I want it now" LOL
 
Cheers

 
are we debating 7 year old comments ?

Seems to be a plague of reawakening dead threads. I feel like I'm in "The Mummy" Sonar edition.