Code inspection: Use preferred namespace body style
tip
note
File-scoped namespaces is a C# 10 feature.
By default, JetBrains Rider automatically detects C# version based on the associated compiler. However, you can specify the target C# version explicitly for a project — press on the project in the Solution Explorer and use the Language version selector on the Application page of the Project Properties dialog .
To set the C# version for all projects in your solution, specify it in a Directory.Build.props file in your solution directory as described here.
tip
Reverse transformation is available with a context action .