maybe I just did not understand … but:
Would it be possible to get back standard setting for blend surface?
When is Interior shapes On, it’s OK, but smooth editing is practically impossible (add new shapes …) And remove all shapes with “picking”?
When is interior shapes OFF then is result incorrect - i have a curvature choice on both shapes, but the result is only position - why?
And edge point ON with place new shape is littlebit unclear too … and impossible to switch off preview …