Random.php

<?php

namespace Drupal\views\Plugin\views\sort;

use Drupal\Core\Cache\CacheableDependencyInterface;
use Drupal\Core\Cache\UncacheableDependencyTrait;
use Drupal\Core\Form\FormStateInterface;

/**
 * Handle a random sort.
 *
 * @ViewsSort("random")
 */
class Random extends SortPluginBase implements CacheableDependencyInterface {
    use UncacheableDependencyTrait;
    
    /**
     * {@inheritdoc}
     */
    public function usesGroupBy() {
        return FALSE;
    }
    public function query() {
        $this->query
            ->addOrderBy('rand');
    }
    public function buildOptionsForm(&$form, FormStateInterface $form_state) {
        parent::buildOptionsForm($form, $form_state);
        $form['order']['#access'] = FALSE;
    }

}