Hello, Rana,
Thanks for such detailed output of your thought and we are really sorry that some of our developers could make some changes which made issues on your web-sites. We will try to assist you better with the next topics you write on our forum. About the “GTIN” fields we asked you to give us access so that we could apply code fix to remove those fields just for you with some php filter use but you decided not to give us access and to remove all gtin fields manually on each product. In case you want to disable “GTIN” fields globally you will be able to add next php code to your child-theme/functions.php ( https://prnt.sc/r4BO65YDBPvr ) after the next theme update
add_filter('etheme_product_option_gtin', '__return_false');
It will disable those gtin fields in the backend and frontend as well -> https://prnt.sc/QOdzz53yvLQv and https://prnt.sc/sPYEsQE5r2mw
Kind Regards,
8theme team