How to set full width product description and features on product page?

Open: /themes/classic/templates/catalog/product.tpl

Find line containg:

{block name='product_tabs'}

Insert code before this line:

</div>
</div>
</div>
<div class="row">
<div class="col-md-12">
<div>

Don't forget to chceck Advanced parameters -> Performance ->

Set this value to "Force compilation" to see changes".

This change was tested on Prestashop 1.7.3.1