You can toggle the visibility of the geometry of a secondary flow path, or any of its boundaries, by toggling the corresponding visibility check box.

You can edit any boundary of a secondary flow path in order to change its type via the Boundary Type setting. The available types are: Wall, Hub Interface, Shroud Interface. The type specification affects meshing details near the boundary.

A type setting of Hub Interface or Shroud Interface makes the Automatically Manage Opening Region setting available. Selecting the latter causes the hub or shroud (as applicable) to be divided into regions; in particular, one of the regions is made to match (line up with) the interface. The resulting passage mesh is therefore able to have nodes that are aligned with the interface edges, facilitating mesh refinement within the passage mesh near the interface edges. The regions that are created in this process can be reviewed in the object editor for Geometry > Hub on the Hub Regions tab, or the corresponding tab for the shroud, as applicable.

Note that, when using the Automatically Manage Opening Region option, the interface must be fully within the inlet or outlet block.