[2019] Pros use White HUDs and I'm wondering if i can get it (possible way in description if you know how Over-Watch's files work)

When the pros play Overwatch at the Blizzard Arena, it looks just like it does for you and me at home. They don’t see the team coloring of the HUD or the Visual FX. They don’t even see the team uniforms. It’s the spectator functionality and the broadcast that makes the game look that way.

You can use some color blind settings to adjust the way things look for you at home, but it’s not quite like the OWL view.

They have custom crosshairs, we only see the hero default crosshair in spectator view.

I think it is a technical limitation of the spectator features.