When I zoom in, using the Vegas Pro 18.0 (Win 10) zoom edit tool, and then want to zoom back out to original track height, if I right-click again with the zoom tool, it minimizes all tracks. I do not see a quick way to return to normal track height. The only way I know to do this is to open each track hamburger menu and do a 'Restore', or else press Ctrl+shift + 'Up' arrow several times, which will simultaneously restore all track heights.