I just about lost my mind trying to figure out why the smooth button wasn't working... Somehow by luck I right clicked the object and figured it out... I've been searching for answers for about a week at least... Can you put some labels on this? All it says is
Smooth
Flatten angles of selected vertices.
Shorcut: Shift Spacebar, Shift 7
I may have glazed over a few details when I started using the new version. But the blender 2.8 manual isn't much help either.
https://docs.blender.org/manual/en/dev/modeling/meshes/editing/transform/smooth.html
It doesn't say anything about using the RMB from what I read.