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// Отключает <p> и <br>

define('WPCF7_AUTOP', false );

add_filter('wpcf7_form_elements', function($content) {
    $content = preg_replace('/<(span).*?class="\s*(?:.*\s)?wpcf7-form-control-wrap(?:\s[^"]+)?\s*"[^\>]*>(.*)<\/\1>/i', '\2', $content);

    return $content;
});