Not sure if this is a bug or intentional behaviour but when I toggle on “Group exports with parameters” it does so only within the Shapediver model/website and not in the iFrame we have embedded on our website.
The settings for iframes are separate from the model view page settings. You can control those in the “Iframe” section of the edit page, below the viewer.
I fully take responsibility for this issue, the layout of viewer and iframe settings can be confusing currently, we are thinking of ways to improve it.