Facebook How to Disable Comments on a Post: Step-by-Step Instructions for Turning Off Comments and Managing Post Engagement
You can disable or sharply limit Facebook comments by using the post menu, but the exact option depends on whether the post is on a personal profile, Page, or group. For most public profile posts, choose who can comment. For group posts, admins can fully turn comments off. For Facebook Pages, comment control is more limited, so moderation tools often do the heavy lifting.