HI!

Sorry, we don't have functionality of automatic removing of the demo content, you can remove it only manually. 

HI!

You can use unregister_post_type action, exmaple:

function delete_post_type(){    
    unregister_post_type( 'thegem_news' );
}
add_action('init','delete_post_type');

Add the code to the functions.php of the child theme, post types names you can see in the:

/wp-content/plugins/thegem-elements/inc/post-types

In the begin of the file:

register_post_type