ソースコード

using System.Reflection;
using UnityEditor;

namespace Kogane
{
    [InitializeOnLoad]
    internal static class RemoveMenuItem
    {
        static RemoveMenuItem()
        {
            EditorApplication.delayCall += Remove;

            void Remove()
            {
                var methodInfo = typeof( Menu ).GetMethod( "RemoveMenuItem", BindingFlags.NonPublic | BindingFlags.Static );

                RemoveMenuItem( "Assets/Create/Folder" );
                RemoveMenuItem( "Assets/Create/2D" );
                RemoveMenuItem( "Assets/Create/Shader" );
                RemoveMenuItem( "Assets/Create/Testing" );
                RemoveMenuItem( "Assets/Create/Playables" );
                RemoveMenuItem( "Assets/Create/Assembly Definition" );
                RemoveMenuItem( "Assets/Create/Assembly Definition Reference" );
                RemoveMenuItem( "Assets/Create/Text" );
                RemoveMenuItem( "Assets/Create/TextMeshPro" );
                RemoveMenuItem( "Assets/Create/Scene" );
                RemoveMenuItem( "Assets/Create/Scene Template" );
                RemoveMenuItem( "Assets/Create/Scene Template From Scene" );
                RemoveMenuItem( "Assets/Create/Prefab" );
                RemoveMenuItem( "Assets/Create/Prefab Variant" );
                RemoveMenuItem( "Assets/Create/Material" );
                RemoveMenuItem( "Assets/Create/Material Variant" );
                RemoveMenuItem( "Assets/Create/Render Texture" );
                RemoveMenuItem( "Assets/Create/Animator Controller" );
                RemoveMenuItem( "Assets/Create/Animation" );
                RemoveMenuItem( "Assets/Create/Physic Material" );
                RemoveMenuItem( "Assets/Create/GUI Skin" );
                RemoveMenuItem( "Assets/Create/UI Toolkit" );
                RemoveMenuItem( "Assets/Create/Search" );
                RemoveMenuItem( "Assets/Create/Brush" );
                RemoveMenuItem( "Assets/Create/Terrain Layer" );

                void RemoveMenuItem( string name )
                {
                    methodInfo.Invoke( null, new object[] { name } );
                }
            }
        }
    }
}