doc/articles/guides/how-to-add-platforms-existing-project.md
If you have an existing Uno Platform project, and you have not selected all the platforms you need when creating the project, this guide will show you how to add new ones.
Considering that your project is called MyProject, and you want to add the desktop target support:
dotnet new templates, using MyProject for its name.Desktop in the platforms selection dialog.MyProject.Platforms/Desktop folder to the existing project structure, at the same level as the other platform folders..csproj, add the net10.0-desktop target framework to the TargetFrameworks property.Your new platform project is now ready to be compiled.
You can repeat a similar process for net10.0-ios, net10.0-android, net10.0-browserwasm, and net10.0-windows10.0.xxxxx.