Injecting CSS into front-end

Hi, the plugin has started injecting CSS into the html of the website, and quite a large file too.
It’s found here schema-and-structured-data-for-wp/admin_section/css/collection-front.min.css.
Can you tell me why this plugin is injecting such a large file into the final page when it’s supposed to just inject schema and structured data?
How can we dequeue the same?