I have sony vegas pro 16 and I was doing some editing. I rushed a bit, so this happened. None of my clips have previews, they're just colored blocks. How do you reverse this?
On a US keyboard, the shortcut to expand and collapse all the tracks at once can be simply be done by pressing the back quote/tilde key (`/~) at the upper left side of the keyboard. You can also go into the "View" menu to toggle the "Minimize All Tracks" option.