Answer:
You can find this setting in Window 1.4 Load, "Characteristic Values" tab, of the add-on module.The design of the first core width applies the permanent actions. The design of the second core width applies the combination of permanent and variable actions.
This means that you have to set which load should be selected for which action in the list of load cases or combinations for the design of highly eccentric loading in the core ("Characteristic Values" tab).