Make order notes field at woocommerce checkout only viewable on front end by Admin level user role [closed]

You could add an admin check with current_user_can(), something like this

function remove_order_notes( $fields ) {
    if (current_user_can('administrator')) return $fields;

    unset($fields['order']['order_comments']);
    return $fields;
}

If the current user is admin, return all fields.