Click on an image, and you will see an enlarged version of it. With this gallery it is easy to navigate from one enlarged image to the next. Creating it is easy, and if more or less images are needed, containers with the class name .picture-container can be duplicated or deleted until you have the number you want.
You may be curious about the hidden HTML element called .may-be-deleted. It is there purely to cause Site Designer to place all the necessary files where they are needed in the Project Resources. Once the component has been saved and put to use, you may choose to delete that hidden element.