FNA-VSCode-Template/project_name/Game1.cs

using System;
using System.Reflection;
using System.Runtime.InteropServices;
using Nez;
using Nez.ImGuiTools;

namespace project_name
{
	class Game1 : Core
	{
		public Game1() : base()
		{
			// uncomment this line for scaled pixel art games
			// System.Environment.SetEnvironmentVariable("FNA_OPENGL_BACKBUFFER_SCALE_NEAREST", "1");
		}

		override protected void Initialize()
		{
			base.Initialize();

			Scene = new DefaultScene();

#if DEBUG
			// System.Diagnostics.Debug.Listeners.Add(new System.Diagnostics.TextWriterTraceListener(System.Console.Out));

			// optionally render Nez in an ImGui window
			var imGuiManager = new ImGuiManager();
			Core.RegisterGlobalManager(imGuiManager);

			// optionally load up ImGui DLL if not using the above setup so that its command gets loaded in the DebugConsole
			//System.Reflection.Assembly.Load("Nez.ImGui")
#endif
		}
	}
}