I'm following another answered question on stackexchange and one of the screencaptures demonstrated the node editor with texture previews on individual nodes including output. This is from a much older version of Blender so I don't know if this feature was removed or is just disabled somewhere in the settings. How do I enable it back if it's just disabled?
UPDATE: It would also really help if I could get newer example of this tutorial as it's very outdated Smooth transition between two materials.