Hello @Nico DeLaO ,
Thank you for taking time to post this issue in Microsoft Q&A forum.
You are right. A blue/purple box is visible when it’s on, and no blue/purple box is visible when it’s off.
Normally, when you turn it on, some excluded folders/files will be visible, such as bin, obj folders. In a simple solution, this is easy to check. But it’s true that if it’s a complex/big solution, it’s not easy to check.
I strongly recommend you raise a suggestion ticket on our Developer Community.
Thank you very much for helping us make Visual Studio better. If you have any further concerns, feel free to let us know :)
Have a nice day!
Tianyu
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