I currently get red squiggly lines for a non-explicit converting constructor. That's superb! My colleagues want that, too. Where the heck did I configure that?
I am quite sure that this is a Jetbrains Resharper for C++ features, because I can disable it via the light bulb and it adds
// ReSharper disable once CppNonExplicitConvertingConstructor
I can't find such a setting in the Resharper Inspection options for C++:
My Resharper version is 2022.3.1. I'm using it in Visual Studio 17.5.3.
You can configure the severity of the inspection either in "ReSharper | Options | Code inspection | Inspection severity" or from the Alt+Enter menu when the caret is inside the highlighted inspection range. As expected, there's also a help page which explains everything in depth