Change layout blog for tag template

Hello I try to change blog layout for tag.php using

From

$avia_config[‘blog_style’] = apply_filters(‘avf_blog_style’, avia_get_option(‘blog_style’,’multi-big’), ‘tag’);
if($avia_config[‘blog_style’] == ‘blog-grid’)

To

$avia_config[‘blog_style’] = apply_filters(‘avf_blog_style’, avia_get_option(‘blog_style’,’multi-big’), ‘tag’);
if($avia_config[‘blog_style’] == ‘single-small’)

But don not work https://www.waterworldsons.it/tag/allevamento-golden-retriever-americano/