Play Mode Scene

Play Mode Scene

 public class StartSceneWindow : EditorWindow
    {
        private const string ScenePath = "Assets/Core/Scenes/MainScene.unity";
        private void OnGUI()
        {
            EditorSceneManager.playModeStartScene = (SceneAsset)EditorGUILayout.ObjectField(new GUIContent("Start Scene"), 
                EditorSceneManager.playModeStartScene, typeof(SceneAsset),false);

            if (GUILayout.Button("Set as Start Scene"))
                SetPlayModeStartScene(ScenePath);
        }
        
        private void OnInspectorUpdate()
        {
            SetPlayModeStartScene(ScenePath);
        }

        private static void SetPlayModeStartScene(string scenePath)
        {
            var desiredScene = AssetDatabase.LoadAssetAtPath<SceneAsset>(scenePath);
            if (desiredScene == null)
                Debug.Log("Could not find Scene " + scenePath);
            else
                EditorSceneManager.playModeStartScene = desiredScene;
        }

        [MenuItem("Baysz /Settings")]
        private static void StartScene()
        {
            GetWindow<StartSceneWindow>();
        }
    }