Moved "Create Scene Setting" button to the Scene Setting management window.

Assets/ScriptableRenderPipeline/HDRenderPipeline/Editor/HDRenderPipelineMenuItems.cs

             }
         }
 
-        [MenuItem("HDRenderPipeline/Create Scene Settings")]
-        public static void CreateSceneSettings()
-        {
-            var allSettings = Object.FindObjectsOfType<SceneSettings>();
-            var activeScene = SceneManager.GetActiveScene();
-            foreach (SceneSettings setting in allSettings)
-            {
-                if (setting.gameObject.scene == activeScene)
-                {
-                    EditorUtility.DisplayDialog("Create Scene Settings", "Scene settings already exist on scene " + activeScene.name + ". \n\n If you want to create on another scene, set it active (double click) first, then select this option in the menu.", "Got It!");
-                    return;
-                }
-            }
-
-            var manager = new GameObject();
-            manager.name = "Scene Settings";
-            manager.AddComponent<SceneSettings>();
-        }
     }
 }

Assets/ScriptableRenderPipeline/HDRenderPipeline/Editor/SceneSettingsManagementWindow.cs

             {
                 CreateAsset<SubsurfaceScatteringParameters>("NewSssParameters");
             }
+
+            EditorGUILayout.Space();
+
+            if (GUILayout.Button("Create Scene Settings"))
+            {
+                var manager = new GameObject();
+                manager.name = "Scene Settings";
+                manager.AddComponent<SceneSettings>();
+            }
         }
     }
 }