Other than needing to be enabled, the extension has no configurable settings.

For single-page documents, the horizontal subgroup tabs are hidden by default behaviour.
This can be overridden by checking the Disable Tab Hiding option in product metadata settings.
When checked, for single-page product the vertical tabs would be shown as defined.

According to the requested field categories, the tab groups need to be created following a naming convention.

Each top level Field category (Layout, Colours, Images, Text, Compliance, Output)
must contain at least one subgroup tab.
Subgroup names need to be named according to the page number
of the design being edited by the options within (e.g. Page 1, Page 2).

Subgroups then can contain any form filling fields for the selected field category and page.