xamarin-macios/dotnet/Microsoft.MacCatalyst.Templates/maccatalyst/MacCatalystApp1.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net6.0-maccatalyst</TargetFramework>
    <RuntimeIdentifier>maccatalyst-x64</RuntimeIdentifier>
    <RootNamespace Condition="'$(name)' != '$(name{-VALUE-FORMS-}safe_namespace)'">MacCatalystApp1</RootNamespace>
    <OutputType>Exe</OutputType>
  </PropertyGroup>
</Project>