Maybe I am not understanding what you are meaning but going to accessibility and then visibility enhancements you can turn contrast theme or high contrast fonts on or off
What phone do you have ?? I think I remember seeing you have a S10 or + on other posts.
Mine is a S10
I will do a bit of searching and see if I can figure out why I have another setting than you
I can't see any obvious settings that would give me the extra setting
Only thing that I can think of is maybe you turned High contrast on and then applied a theme that might have taken away that setting.
Do you have a theme applied other than the one that came on the phone??