The hanging system must be set in the Shelf Properties tab. In the Hanging System section you can set various properties related to the hanging systems. It is essential to check the box Use Hanging System. In the fixture preview this will be reflected by a dotted background of the shelf.

Hanging system settingThe planogram for the hanging system is created by inserting products into the dotted part of the template.

Planogram for hanging system

You can find out more in the Hanging system manual.