The most common way to use a Facebook page viewer is through the platform's own tool. This feature is designed to show you exactly what your profile or page looks like to someone who isn't your friend or a follower.
Facebook provides native tools to help page administrators understand their audience without compromising individual user privacy. facebook page viewer
If you manage a business Page, you can track "Page Views," which tells you how many people visited your Page sections. The most common way to use a Facebook