Parent theme, Child theme and a Function code

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I was using the code below to remove the URL part from the comment form.

function jlwp_disable_comment_url($fields) { 
unset($fields['url']);
return $fields;
}
add_filter('comment_form_default_fields','jlwp_disable_comment_url');

I still use it. But I noticed something. When I switch to the child theme, I need to add it to the parent theme for this code to work.

While using this code in the Child theme, I noticed that the website field is still visible in the comments section. It was fixed when I deleted the code from here and added it to the parent theme.

What would you say about it?