(customization) What file I have to modify to add a label on thumbnail of products?

Hello @Wikafy,

You can add custom content by using hooks in the child-theme/functions.php file. For example:

add_filter('etheme_product_grid_list_product_element_image', function($image, $product, $local_settings) {  
    $badge .= 'Text';  
    return $image . $badge;  
}, 10, 3);

You can find the list of available hooks and filters in the following post:
https://www.8theme.com/topic/add-custom-content-after-product-title-on-archive-page/#post-470675

Best regards,
Jack Richardson
The 8Theme’s Team

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Topic closed.
The 8Theme Team