Please provide a "none" option for site font (and other options)

In our case (all defaults, incl. subtheme name) it was "drupal8_w3css_theme/d8w3css-gfin-open-sans" to find:

function drupal8_w3css_subtheme_page_attachments_alter(array &$attachments) {
 // print_r($attachments);
  $gfex_open_sans = array_search('drupal8_w3css_theme/d8w3css-gfin-open-sans', $attachments['#attached']['library'], TRUE);
  unset($attachments['#attached']['library'][$gfex_open_sans]);
}

Hello,
"None" option was added to dev version and it will be in the next release 2.0.12.

Best wishes,
Alaa

thank you, that's awesome !