Preprocessor greyedout

At the moment I'm evaluating the Keil5 ide.
In Coocox the compiler will gray out the unused preprocessor code, is very handy.
Can't find this option in Keil uvision 5, how do you guys do that?
How can you read (and understand) the code if you don't know what's used or not.

Example: my.st.com/.../gray.PNG

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