Do you have multiple offices? Add them as locations via Settings > Company > Locations (Instellingen > Bedrijf > Locaties) and click the button in the top right to create a location.
Example: your staffing agency has a branch in Tilburg and one in Eindhoven. With locations, recruiters in Tilburg do not see the vacancies and candidates of Eindhoven, and vice versa.
For vacancies, clients and candidates, you then choose which branch they belong to.