Edit:
I found this post: https://forums.garmin.com/sports-fitness/healthandwellness/f/vivoactive-4-series/195082/display-color
And think I have the sad answer. I didn't change it to purple, that's just how it is when the backlight is on. :(
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How do I change the background color of the watch face / menus on my Vivoactive 4s? It is set to purple, which I may have done somehow, but I can't find the option again. I have a watch face that I'm using that would look much better with black as the background color (there is no way to set it from within the watch face). Even the menus have a purple background, and I'd rather they be black, too. HELP! Thank you!