You can enable multiple window support within an application by opening the project settings and, under Deployment Info, checking the Supports multiple windows checkbox. While this small change will allow you to have multiple instances of the LootLogger interface open, each of those instances will have its own instance of ItemStore and therefore its own items. This is not what you would like.

For this challenge, update LootLogger to support multiple windows and share its ItemStore across scenes. You will want a way for one scene to be updated in response to an event in another scene. For example, if a user adds a new Item in one scene, it should also appear in the items list for any other scene.