Is there any way to enable Overwatch League's overhead view?
This view is only available in the tournament local server and not to the public. They should definitely make it available to everyone but currently, normal players like you and me do not have access to it
Best source I can give you is https://www.reddit.com/r/OverwatchLeague/comments/7rtqzq/how_do_the_announcers_show_the_overhead_view/dszkfy0/?context=0