Reduce cluter in Unity Editor Create Menu

EditorMenuCleanup.cs

using UnityEngine;

namespace AGES.Tools.Editor.EditorMenuCleanUp
{
    public static class EditorMenuCleanup
    {
        [UnityEditor.InitializeOnLoadMethod]
        private static void MenuCleanUp()
        {
            UnityEditor.EditorApplication.delayCall += RemoveMenuItems;
        }

        private static void RemoveMenuItems()
        {
            System.Reflection.MethodInfo removeMenuItemMethod = typeof(UnityEditor.Menu).GetMethod("RemoveMenuItem", System.Reflection.BindingFlags.Static | System.Reflection.BindingFlags.NonPublic);
            if (removeMenuItemMethod == null)
            {
                Debug.LogError("Method 'RemoveMenuItem' not found!");
                return;
            }

            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Lens Flare");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Lens Flare (SRP)");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Lightmap Parameters");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Avatar Mask");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/GUI Skin");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Legacy/Cubemap");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Deform/Vertex Cache");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Custom Font");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Terrain Layer");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Brush");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Lighting Settings");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Custom Render Texture");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Shader Variant Collection");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Scene Template Pipeline");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Scene Template");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Animator Override Controller");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Audio Mixer");

            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Visual Scripting/Script Graph");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Visual Scripting/State Graph");

            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Text/Font Asset");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Text/Font Asset Variant");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Text/Sprite Asset");
            
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Testing/C# Test Script");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Testing/Tests Assembly Folder");

            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Signal");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Needle/Console/Synthax Highlighting Theme");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Needle/Console/Console Filter Preset");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Gemserk/Favorites Assets");
            
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Search/Assets Index");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Search/Prefabs Index");
            RemoveMenuItem(removeMenuItemMethod, "Assets/Create/Search/Scenes Index");
        }

        private static void RemoveMenuItem(System.Reflection.MethodInfo removeMenuItemMethod, string name)
        {
            removeMenuItemMethod.Invoke(null, new object[] { name });
        }
    }
}

Add this script to your Scripts/Editor folder to reduce clutter from third party assets

Adjust the RemoveMenuItem to fit your needs.