VirtualFramework/Assets/Scripts/Editor/OpeanCustomScene.cs

using UnityEngine;
using UnityEngine.SceneManagement;
#if UNITY_EDITOR
public class OpeanCustomScene : MonoBehaviour
{
    [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
    private static void Initialize()
    {
        if (FixedMainEditor.isFixedMain)
        {
            Scene scene = SceneManager.GetActiveScene();
            if (!scene.name.Equals("Main"))
            {
                SceneManager.LoadScene("Main");
            }
        }
    }
}
#endif