Hi Kian,
It seems that the Attribute page is coming from a custom taxonomy, to modify the specific taxonomy page please find the details in this article: https://developer.wordpress.org/themes/basics/template-hierarchy/#custom-taxonomies
Alternatively, you can try by adding the following custom JavaScript code into the Theme Options > JS.
jQuery(document).ready(function($)
{
if(!jQuery('ul.products').hasClass('cols-4'))
{
jQuery('ul.products').addClass('cols-4');
}
});
Remember that the above code will work if copied as it is and don’t conflict with any existing style.
Please note that the code provided serves only as a guide to help you get started custom coding on your own if there’s no option offered in our theme or the products we bundle.
We do not provide support for custom codes that means we can’t fix it in case it conflicts with something on your site nor will we enhance it.
Thanks