It appears that the new Subscription Advantage Pack has hidden the Structural Settings dialog. Prior to the update it was located on the Structure Panel on the Home ribbon tab. The update adds a new Ribbon tab called Structure, but no access to Structural Settings via a sneaky arrow at the base of one of the panels as might be expected.
There is no Structural Settings listed under Settings on the Manage Ribbon tab either. As a comparison, in Revit Structure there is a large button dedicated to this.