Taming webform configuration

settings.local.php

<?php

// Disable promotion on /admin/structure/webform.
$config['webform.settings']['ui']['promotions_disabled'] = TRUE;

// Disable requirements warnings all over /admin/reports/status.
$config['webform.settings']['requirements']['cdn'] = FALSE;
$config['webform.settings']['requirements']['spam'] = FALSE;

// Disable misc clutter / weirdness.
$config['webform.settings']['ui']['video_display'] = 'hidden';
$config['webform.settings']['ui']['description_help'] = FALSE;
$config['webform.settings']['ui']['help_disabled'] = TRUE;
$config['webform.settings']['ui']['support_disabled'] = TRUE;

webform-state.php

<?php
# drush php:script webform-state.php
\Drupal::state()->set('webform.element.message', [
  'webform.help.installation' => TRUE,
]);