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Applies to: 
Visual Studio 
Visual Studio for Mac
Note
This article applies to Visual Studio 2017. If you're looking for the latest Visual Studio documentation, see Visual Studio documentation. We recommend upgrading to the latest version of Visual Studio. Download it here
Use the CodeLens options page to modify the text editor CodeLens settings for F#. To access this options page, choose Tools > Options, and then choose Text Editor > F# > CodeLens.
CodeLens
Enable CodeLens (Experimental)
When this option is selected, interactive annotations appear in the code that let you easily find references and changes to your code, linked bugs, work items, code reviews, and unit tests.
Use colors in annotations
Select this check box to display the CodeLens annotations in color to easily differentiate the items CodeLens reports.
Show annotations to the right instead of above the line
By default, CodeLens annotations appear over a code line. Select this check box to have the annotations appear to the right of the code instead of above it.
Annotation prefix
You can change the default prefix that is used for the annotations.