xamarinmac 
namespace System.CommandLine.Builder
{
    public static class CommandLineBuilderExtensions
    {
        public static CommandLineBuilder! UseHelp(this CommandLineBuilder! builder, int? maxWidth = default);
    }
}
nuget.org
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Reference this API
.NET 5.06.07.08.09.010.0
.NET Core 2.02.12.23.03.1
.NET Framework 4.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard 2.02.1
Information specific to xamarinmac
Assembly

System.CommandLine , Version=2.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs a package reference to System.CommandLine.

Package System.CommandLine (2.0.0-beta4.22272.1) netstandard2.0
Preview This API is contained in a prerelease package.
Platform Restrictions

This framework does not have platform annotations.

  • Built-in API
  • Package-provided API