If you are concerned about being viewed anonymously, you can tighten your own Audience and Visibility settings :
To be fair, Facebook does provide some information about who is engaging with your content, but it's not a list of every visitor. Here’s what you can actually see: anonymous facebook profile viewer
The safest way to navigate social media is by respecting the privacy settings established by the platform and its users. If you are concerned about being viewed anonymously,
Have you ever wondered who is checking out your Facebook profile, or felt the urge to sneak a peek at someone else's, but wanted to keep your curiosity a secret? The search for an "anonymous Facebook profile viewer" is one of the most common, yet misunderstood, queries on the internet. queries on the internet.