Visual Studio C# Code colour of this

I have been fiddling with the colours of the various C# items in my new Visual Studio 2017 (Community) using the Tools->Options->Font and Colors. Everything is fine apart from the this keyword.

Does anyone happen to know which of the Display Items one can change the colour of will affect the this keyword?

It's just a keyword, the same as all the others. I don't think you can tell VS to highlight it differently to other keywords.

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