Isn’t there a “clean” way to do this in Blender 3.1? The curve looks fine until I hit the “2D” switch. But the shape was never intended to be anything but “two-dimensional.”
Working with another “legacy project …” Looking for the easiest available “current” way.
I wound up just doing the (small and simple …) model over, carefully clicking “2D” from the very beginning. What puzzled me is that, when building the original curve, I never consciously used three dimensions. (Constructed from a “front” view.) Yet, when I clicked “2D” after the fact, the model “went wonkers.” Oh, well. Small and simple model. “Over and out…”