Hi there,
this article explains removing fields from the comment form:
https://docs.generatepress.com/article/remove-e-mail-and-url-field-from-comment-form/
To just remove the URL your snippet will look like:
add_action( 'after_setup_theme', 'tu_add_comment_url_filter' );
function tu_add_comment_url_filter() {
add_filter( 'comment_form_default_fields', 'tu_disable_comment_url', 20 );
}
function tu_disable_comment_url($fields) {
unset($fields['url']);
return $fields;
}