I checked the box for the social share button under additional options and there is no any social icon buttons display on my single post. I also add the Easy Share Button app and it does not work either. Anyone has the same issue?
This plugin provides two ways to display the social icons, one by using shortcodes and via widgets. So, if you want to display the social icons in your single post then you can use the shortcode in the very post.
But it seems like you have mistaken social icons for the social share, so if you want to display the share buttons in your single posts then you can use easy social share plugin. And if you faced issue with it then you can post your query in its respective forum.