Thanks for checking out the plugin!
It looks like you are running the Yoast plugin on your site. For categories, currently this plugin is designed to defer to any existing Yoast category noindex settings. If the primary yoast settings for “Show categories in search results” is disabled, this plugin will not override the noindex directive from yoast.
This plugin can still set the “follow/nofollow” directive as Yoast does not have a specific setting for that.
Let me know if that helps, or if you run into any other issues.