Simply add
Styles::remove([style_hook]);
To your theme’s functions.php
Hooks:
jigoshop.shop – all shop pages
jigoshop.user.account – all account pages
Sorry not having much joy here – tried this but not working?
//REMOVE JIGOSHOP CSS
add_action('wp_head','jigo_remove_action', 1);
function jigo_remove_action() {
remove_action('wp_head', 'jigoshop.shop');
}
remove_action('jigoshop.shop', 10);
I’ve just performed the upgrade and I’m having the same problem. How do I disable JigoShop’s built-in CSS?
Adding:
Styles::remove([style_hook]);
to the end of my theme’s functions.php just breaks the entire site:
Fatal error: Uncaught Error: Class 'Styles' not found in /var/www/foxbox/wp-content/themes/easel/functions.php on line 427

Similarly I don’t understand what this part of the suggested solution means:
Hooks:
jigoshop.shop – all shop pages
jigoshop.user.account – all account pages
Did you solve the problem in the end @rickblackdog?