Unused Variable or Method in Visual Studio C#

Unity Engine
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1

Hi there!

I using Unity 2022.3.25f1LTS with Visual Studio C# 2019
(Yes 2019 is old But it mostly statble for my project)

and I really want to just set a color of my code in Visual Studio
when I never use some method of variable it go darker right?

But my eyes vision still not ok, even they are darker,
But still not easy to see,

so I should go to customization the VS instead by find the way to change the color to mostly clear!

is it possible?

I see Fonts and Colors in Visual Studio Options and I see a lots of
items in Display Items, and most of them I don’t know what is it…
I can simply just change a color of string or number

But I really want to change a color of some unused methods or variables
What is the item? anyone?

Thanks!