Competency based recruitment means you define a job in terms of required competencies and then only select candidates based on these competencies and not much else. So you should only invite candidates with a high match score, based on the selected lens, indicating that they have a high likelihood of showing the competency behaviors.
Once you have invited the candidates, the importance of these competencies of course remains. During the interview you should keep the focus on those behaviours that are relevant to the job. To help you with this, Assessio has composed Interview guides with questions to ask candidates. For the best recruitment results, the same questions should be asked to all candidates and their answers should be compared afterwards.