Reputation: 27683
That's the button on the bottom of Visual Studio on the (not extreme) left.
It looks like this:
It's there when a C# code file is shown.
Upvotes: 1
Views: 781
Reputation: 4957
That button is part of the "file health indicator". You can disable the whole feature but not just the button.
Go to Tools > Options... > Text Editor and uncheck the "Show file health indicator" option.
After disabling it, if you need something similar to the file health indicator, I suggest taking a look at the Solution Error Visualizer extension.
Upvotes: 2