Convert to Non-Global Using refactoring
note
Global using directive is a C# 10.0 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 AltEnter 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
The reverse transformation from local to global
using
directives is available via the Convert to Global Using refactoring.