If you use a third-party theme for your Magento 2 store and have enabled "Use Magefan Blog Comments" as a blog comment option and flushed the Magento cache
but still cannot see the comments on the blog post page on the storefront, please compare layout file blog_post_view.xml in your theme folder
and the original blog_post_view.xml layout file from the blog extension code.
you may have missed XML nodes in the theme layout.
Correct theme layout file, save changes and don't forget to flush Magento cache again.