Creating the main menu
Now is a good time to create the starting point for our game. Go ahead and save the current scene. We will make a new scene that will be used as the starting point of our game. To create the new scene, you will need to select File | New Scene. Go ahead and save the scene. I called my scene MainMenu.
Now we have a clear canvas that we can work with to create our Main Menu. In the Hierarchy window, right-click and select UI | Panel. This will create a Canvas GameObject and an EventSystem GameObject, and place them in your Hierarchy window. You will notice that the Panel UI Object is a child of the canvas. All UI elements will be a child of a canvas. Your Hierarchy should look something like the following screenshot:
There are several key aspects that we want to make sure are set properly. These are namely on the Canvas GameObject. Select the Canvas GameObject and look at the Inspector Window.
For this particular canvas, make sure that the Render Mode is set to Screen Space...
