How to Adjust Track Size/Height in Media Composer
Change Track Height/Size in Media Composer
How to change the track height/size in Avid Media Composer.
You can also find these commands in the EDIT menu. You must first select the tracks you want to alter.
The quickest way is to use the keyboard shortcut
Ctrl+L for Enlarge and Ctrl+K for Reduce. (Command+L and Command+K on Mac).

You can also find these commands in the EDIT menu. You must first select the tracks you want to alter.