BP Spline mesh sharp edge (from Zak's tutorial)

Hello,

I’m following piece by piece the tutorial from Zak about using splines & splines components in BP ([Using Splines & Spline Components | Live Training | Unreal Engine - YouTube][1])

Problem is, I’ve redone it several times and I can’t get the same result, the problem being the track is not smoothing at all.I go sharp edges.

I’m trying on version 4.20.1. May be things have changed ? Any idea about this?