The SelectionManager, available in loft, sweep, and boundary surface features only, combines and replaces contour and smart selection, while offering enhanced selection capability.
(Features toolbar) or Insert, Boss/Base, Loft. 
The SelectionManager appears. The Select Group
tool is active.

.
Closed Group<1> appears under Profiles
.
in the PropertyManager as Closed Loop<1> and <2>.
.
and select the first section of the guide curve shown.
The callout appears indicating there is a tangent sketch segment.
The callout changes color indicating the tangent sketch segment is selected.
.
, then select the three remaining guide curves.One Open Group and three Open Loop selections are listed under Direction 2.
in the PropertyManager. 
See SelectionManager in the help.