VolumeInstanceHelper.cs

namespace UnityEngine.Rendering
{
    public class VolumeInstanceHelper : MonoBehaviour
    {
        [HideInInspector]
        public Volume Volume;

        private void OnValidate()
        {
            if (Volume == null)
            {
                Volume = GetComponent<Volume>();
            }
        }

        public void CreateProfileInstance()
        {
            var instance = Volume.profile;
        }

        public void ClearProfileInstance()
        {
            if (Volume.HasInstantiatedProfile())
            {
                var profile = Volume.profile;
                if (profile != Volume.sharedProfile)
                {
                    if (Application.isPlaying)
                    {
                        Destroy(profile);
                    }
                    else
                    {
                        DestroyImmediate(profile);
                    }
                }

                Volume.profile = null;
            }
            
        }

    }
}


using UnityEngine;
using UnityEngine.Rendering;

namespace UnityEditor.Rendering
{
    [CustomEditor(typeof(VolumeInstanceHelper))]
    public class VolumeInstanceHelperEditor : Editor
    {
        public override void OnInspectorGUI()
        {
            DrawDefaultInspector();
            VolumeInstanceHelper modifier = (VolumeInstanceHelper)target;

            

            if (modifier.Volume.HasInstantiatedProfile())
            {
                EditorGUILayout.Space();
                if (GUILayout.Button("Clear instance"))
                {
                    modifier.ClearProfileInstance();
                }
            } else
            {
                EditorGUILayout.Space();
                if (GUILayout.Button("Create instance"))
                {
                    modifier.CreateProfileInstance();
                }
            }
            
        }
    }
}