In the video I hit the E (extrude) key and the extruded faces moved up, which is default behavior. However I didn’t want them moved up because technically that’s a second operation following the extrude operation. To negate the second (move up) operation I clicked the Right Mouse Button to cancel it, BUT still keep the extrusion. After right clicking we can use ALT + S to push out or pull in the direction of the face normal which creates the thickness.
