Thanks for quick reply,
But..
After upload site.php to template folder (I have HelixUltimate) Introtext have html tags, but I have layout with 4 articles horizontal and I see only one which is very long (more than 5000px), and other articles gone...
I see there is only one change in site.php to oryginal in line 405:
$output .= '<div class="sppb-article-introtext">' . mb_substr(strip_tags($item->introtext), 0, $intro_limit, 'UTF-8') . '...</div>';
new:
$output .= '<div class="sppb-article-introtext">' . mb_substr($item->introtext, 0, $intro_limit, 'UTF-8') . '...</div>'
Can you check in your enviroment why this not works?