In the video there are 5 options in the Boundary Surface drop down menu. In my SWX 2018 there are only 3 options. What is the reason for that? I wish to know whether nature of the profile is a precondition for number of options displayed. Because I was able to see 5 options some times.

SolidWorks Surfacing: Avoiding Degenerate Surfaces - SolidWorks Training by SolidWize - YouTube

Time 0.41

Maha,

I was able to find this information on the SOLIDWORKS 2018 Help page here: 2018 SOLIDWORKS Help - Boundary PropertyManager

Default:(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 theDraft angleandTangent influence (%).Direction Vector:Applies a tangency constraint based on a selected entity used as a direction vector. Select aDirection Vector, then set theDraft angleandTangent 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 (%).