It seems that switching from one material to another in Object mode is not updating the real-time render view or the full "Render" output window with the newly chosen material - instead, only one material in my list is still being used.
In attached screenshots "peep blue 01" is the initial selection and render output - it's a light blue material.
When going to the Materials tab and choosing "peep blue 02" I see the correct Preview for that darker and more glossy material, but the change is not reflected in either the real-time render view or when I run a full Render in a new output window for that object. It did show correctly in renders when I first created the material, but switching back is not taking effect.
I figure this is something simple, but this amateur Blender user is kind of stumped. Advice welcome!