Cant change default spline length

Win 10 Ue4 4.23


Following a tutorial on spline meshes:Unreal Engine 4 Tutorial - Splines - Spline Meshes - YouTube
However my default spline length is way to short for the mesh itself. The Blueprint default length is set to the mesh dimensions in ue4 but the viewport mesh doesnt update to the specified size. Even after compiling the mesh stays too short. Changing the scale along an axis changes the viewport view but messed up the mesh while extending it along the x axis.

Any help appreciated!