I know about this but it's not what I want to do.
I know that to limit the number of character of the intro text you can change
php echo $this->item->introtext;
Into
php echo JHtml::_('string.truncate', $this->item->introtext, 150);
In the file html/com_content/category/blog_item.php
But this overriden file contains only
require HelixUltimate\Framework\Platform\HTMLOverride::loadTemplate();
So I don't know where to change it .
What do you mean by "please check other issues"?
Thanks in advance
Sandra