According to the Release Notes (and a recent AskNK vid) the Blender 4.0 beta is supposed to have Nodes Preview in the Shader Editor. I’ve looked for it in the beta downloads from the Daily Builds, haven’t found this in any of them (including the current-as-of-this-posting build).
Is there something I’m supposed to enable in Preferences or somewhere to make this option available?
Edited to add: never mind, this is in the Compositor, not the Shader Editor. 