High Sierra, Apple Mail 11.5 - WHITE flash!

[Wild Hare]

Possibly a very stupid question...

BUT is there any way to change the overall window color(s) in Apple Mail 11.5 / under High Sierra? This is possible under later versions(?). My eyes are increasingly tired of the "white flash" upon opening the Mail app (and when reading & composing mail).

 

[MysticCow]

I don't ever remember even trying to change the colors in Apple Mail.