In Unity, the screen where we work with all content is known as a Scene. A Unity application can be just a single scene, or multiple scenes. For example if we were to design a complex VR application that simulated a building, it can be designed such that each separate floor or room is a separate scene. 

By default, when a new Unity Project is created, Unity opens a sample scene that contains only a Camera and a Light.

If choosing to design an application with multiple scenes, remember to save each scene with distinct names to not lose any progress. More information about scenes can be found here: Scenes.

If you have downloaded the source code for our reference project, open it through your Unity Editor. The initialization could take a few minutes. To ensure the correct scene is displayed open the Asset directory in the Project window and then open the Scenes directory. It should look like so:

Double click ProjectScene and our scene should open up. The camera settings could be a bit disoriented when imported, so use the camera controls to set the camera angle to your liking.