Disabling Intellisense warnings for third party libraries

[Ha Jun]

I'm working on a C++ project that's in the process of migrating from Visual Studio 2017 to 2019. In the project we're using third party libraries, some of which are deprecated (such as Qt4). In Visual Studio 2019 Intellisense is throwing up a lot of warnings about some of these third party libraries, flooding my Errors List. None of these warnings were present in Visual Studio 2017.

Is there a way of telling Intellisense to not look inside certain directories? Or some alternative solution?

I've tried adding the following to the additional compiler options (Property Pages -> C/C++ -> Command Line -> Additional Options):

/experimental:external /external:I ${ThirdPartyIncludesDirectory}

to mark the external libraries' directory as system (Broken Warnings Theory | C++ Team Blog) but that's made no difference. I'm guessing Intellisense doesn't look at this?

I'd rather not turn Intellisense warnings off entirely since it can give useful warnings in code I'm writing. And adding pragmas inside my own code to hide warnings from includes won't work because the warnings come from includes within the third party library.

Any suggestions would be great!

My Visual Studio info:

Microsoft Visual Studio Community 2019
Version 16.2.0
VisualStudio.16.Release/16.2.0+29123.88
Microsoft .NET Framework
Version 4.7.03056

Installed Version: Community

Visual C++ 2019 00435-60000-00000-AA788
Microsoft Visual C++ 2019

ASP.NET and Web Tools 2019 16.2.290.48383
ASP.NET and Web Tools 2019

C# Tools 3.2.0-beta4-19359-03+15b43b33901c88f68ef43f8314b5a2457716780d
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ClangFormat 1.0
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IntelliCode Extension 1.0
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Visual Basic Tools 3.2.0-beta4-19359-03+15b43b33901c88f68ef43f8314b5a2457716780d
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