I see only ASP.Net 4.8 or 3.5.30729.4926 in the Plesk Control Panel. How do I change ASP.NET to ASP.NET Core?
All versions of ASP.NET Core are installed server-side and available to all customers. There is no option to switch to it, as it is available by default. The ASP.NET 4.8/3.5 version switcher is a completely separate option not associated with .NET Core.