Product Tags in Add New product as checkbox list [closed]

That’s only one way to achieve that, but it’s the easiest, I guess.

The taxonomy UI is displayed as list of checkboxes, if given taxonomy is hierarchical.

So if you change the product tags to hierarchical, it will solve your problem.

And it’s pretty easy to change, because there’s a hook for that:

function my_woocommerce_make_tags_hierarchical( $args ) {
    $args['hierarchical'] = true;
    return $args;
};
add_filter( 'woocommerce_taxonomy_args_product_tag', 'my_woocommerce_make_tags_hierarchical' );