(Available when you have a minimum of three curves in the direction.) Approximates a parabola scribed between the first and last profiles. See Start/End Constraints in the Loft PropertyManager. The tangency from this parabola drives the lofted surface, which results in a more predictable and natural lofted surface when matching conditions are not specified.
None
No tangency constraint (zero curvature) is applied.
Normal to Profile
(Available when the curves are not attaching a boundary feature to existing geometry.) Applies a tangency constraint normal to the curve. Set the Draft angle and Tangent influence (%).
Direction Vector
Applies a tangency constraint based on a selected entity used as a direction vector. Select a Direction Vector, then set the Draft angle and Tangent influence (%).
Tangency to Face
(Available when attaching a boundary feature to existing geometry.) Makes the adjacent faces tangent at the selected curve. Set the Tangent influence (%).
Curvature to Face
(Available when attaching a boundary feature to existing geometry.) Applies a smooth, visually appealing curvature continuous surface at the selected curve. Set the Tangent influence (%).
Obviously NONE is negating “Tangency to Face” option. Other two potions are in question. “Direction Vector” option can be ignored as it is for a particular situation. But nothing mentiond about the “Curvature to Face” option.
Attach your *.sldprt file here and end all doubt.
I recommend spending a bit more time in formulating thread title as well.
A good title helps in future searches by beginners researching existing information.
I would expect to see the term "Boundary Surface" in the thread title.