I have 2 projects, one using Unity 2017 and the other using Unity 2020. I have both Unity versions installed correctly. I have both Visual Studio Community 2017 and Visual Studio Community 2019 installed correctly. Unity 2017 won't work correctly with Visual Studio 2019. Unity 2019 won't work correctly with Visual Studio 2017. In the preferences of the Unity 2017 project, I choose the external tool 'Visual Studio Community 2017'. In the preferences of the Unity 2020 project, I choose the external tool 'Visual Studio Community 2019'. Unfortunately that preference is common to both Unity versions, both Unity version will always use the same external tool. Is there a way to avoid having to go in the preferences each time I open a new project?