Hello Rogerio,
You need to use the voicing facilities ('Organ settings | Pipe and rank voicing' on the menu) within the Hauptwerk Advanced Edition (which you can choose to evaluate when launching Hauptwerk). They're covered in the 'Voicing facilities' section in the main user guide (pages 175-178 in the current v4.2.1 version).
The levels of the virtual St. Anne's ranks are actually very close to the those of the real St. Anne's organ (e.g. the Dulciana is intended to be a quiet rank), but you can change them if you prefer via the voicing facilities.