add_action('wp_dashboard_setup', 'my_custom_dashboard_widgets');

function my_custom_dashboard_widgets() {
   global $wp_meta_boxes;

Remove these dashboard widgets…

   unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins']);
   unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
   unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);

Add a custom widget called ‘Help and Support’

   wp_add_dashboard_widget('custom_help_widget', 'Help and Support', 'custom_dashboard_help');
}

This is the content for your custom widget

 function custom_dashboard_help() {
    echo '<p>Lorum ipsum delor sit amet et nunc</p>';
}
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