Does any one know when I am in Viewport shading why it say’s “viewport compositor setup not fully supported” it comes up on the left of the screen right below render done. Is this a setting in the preferences I missed?
Hum, it’s just as it says , when using the viewport compositor, some features are missing :

Basically viewport compositor supports only one viewlayer, but since it’s new it also depends on the blender version you’re using !
Not every pass/layer/setup is supported with the viewport compositor.