Force the Yoast metabox to be closed by default.

close-yoast-metabox.php

function collapse_yoast_matabox()
{
  if (!class_exists('WPSEO_Metabox')) {
    return;
  }
  echo /*html*/ '
  <script>
  document.addEventListener("DOMContentLoaded",
    function(event) {
        document.querySelector(".yoast.wpseo-metabox").classList.add("closed");
    });
  </script>';
}
add_action('admin_head', 'collapse_yoast_matabox');