The YOOtheme page builder is a helpful tool to create whole pages but it has a couple of downsides.
If you use the page builder to edit a content item when it is displayed it takes over the display of the whole page.
If you show this content item in a blog or multi-item view - the teaser field is a non-structured dump of the HTML and images of the carefully constructed content item
An alternative to showing this poorly constructed teaser is to write a custom 'excerpt' field