Simply put, you can't. Facebook is designed to protect the privacy of its users, and that extends to the reporting mechanism.
If one of your posts or actions gets flagged, Facebook will notify you about the specific violation, but the identity of the individual or group who reported you remains confidential.
This policy is in place to prevent potential retaliation or harassment, ensuring that users can report concerns without fear of backlash.
It emphasizes the platform's goal of creating a safe environment where content, not personal disputes, is the primary focus.