Change the current behaviour of how preview works. Instead of showing the final output it would be more appealing and logical to Preview the selected active node.
Viewer node (Viewer Palettes) to Check your node tree at any Point you get to grips with how the Node Graph serves the Layers palette. choose the node you want to Watch and click Alt + 1 on the keyboard to associate the Viewer node. You can associate up to 9 nodes to the Viewer node.