UserRow.php

<?php

namespace Drupal\user\Plugin\views\row;

use Drupal\views\Plugin\views\row\EntityRow;

/**
 * A row plugin which renders a user.
 *
 * @ingroup views_row_plugins
 *
 * @ViewsRow(
 *   id = "entity:user",
 * )
 */
class UserRow extends EntityRow {
    
    /**
     * {@inheritdoc}
     */
    protected function defineOptions() {
        $options = parent::defineOptions();
        $options['view_mode']['default'] = 'full';
        return $options;
    }

}