By default, container nodes are translucent so you can partially see external nodes or connections underneath them. You can make container nodes opaque by selecting Opaque Containers from the Hypergraph or Hypershade options menu.
You can also set the background for each container in the Hypergraph to a custom image. This can help you quickly identify a container by sight.
To customize the background of a container in the Hypergraph
-click
the border of your container and select Set Background Image from
the pop-up menu.