Customize Tag/Archive page

oh – is hard to inspect your site, one would probably have to know a translation service ;)

it depends on the exact page what you had to customize. Is it an archive category page or a archive tag page?
then: it is tag.php – but i guess that it is only here on board a typo ?

can you temporarily remove the child-theme tag.php – and put this to your child-theme functions.php:

add_filter('avf_blog_style','avia_change_tag_blog_layout', 10, 2); 
function avia_change_tag_blog_layout($layout, $context){
if($context == 'tag') $layout = 'blog-grid';
return $layout;
}

add_filter('avf_post_slider_args', function($atts, $context){
  if($context == 'tag') {
    $atts['type']  = 'grid'; 
    $atts['columns']  = 1;
  }
  return $atts;
}, 10, 2);

and this to quick css

#top.tag .entry-content-wrapper .post-title{
  margin-bottom: 40px
}

#top.tag .slide-entry-wrap {
  margin-bottom: 10px;
}

#top.tag .slide-image {
  display: none !important;
}

#top.tag .slide-content > :not(.entry-content-header) {
  display: none;
}

#top.tag .slide-entry-wrap .entry-content-header .slide-entry-title:before {
  content: "Article:";
  font-size: inherit;
  font-weight: inherit;
  color: #666;
  padding-right: 15px;
}