You can try disabling the Page Title page setting found in the right column when editing the blog page. If that doesn’t respond then you’ll need to go to Settings > Reading, deselect the posts page. Go back to your Blog page and insert a Post Loop widget via Page Builder at which point the Page Settings should reflect. I haven’t tested this which is why I’m laying out both options.
It’s great to have you here on the forums but if you’d like to keep replies private, it would be better to reach out over email. The private reply checkbox is here mostly for sharing passwords and the like. Thanks 🙂