net9.0-windows10.0.22621 
namespace System.Windows.Forms
{
    public sealed class Application
    {
        [Experimental("WFO5001", UrlFormat = "https://aka.ms/winforms-warnings/{0}")]
        public static void SetColorMode(SystemColorMode systemColorMode);
    }
}
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Reference this API
.NET 9.0
Information specific to net9.0
Platforms This API is only available when you target a specific platform:
Windows 7.08.010.0.1776310.0.1836210.0.1904110.0.2034810.0.2200010.0.22621
Information specific to net9.0-windows10.0.22621
Assembly

System.Windows.Forms , Version=9.0.0.0, PublicKeyToken=b77a5c561934e089

Referencing

Your project needs to set <UseWindowsForms>True</UseWindowsForms>.

Preview WFO5001: This API is marked as experimental.(more details)
Platform Restrictions

This API is only supported on the following platforms:

  • Windows >= 6.1
  • Built-in API
  • Package-provided API