Disable + and – sign

function wac_button_div($label, $identifier) {
    $link = '<b><a href="" class="wac-btn-'.$identifier.'">'.$label.'</a></b>';

    $div = '<div style="display: none; border-radius: 5px; padding-left: 7px; padding-right: 7px; padding-bottom: 5px; background-color: lightgray">' . $link . '</div>';

    return $div;
}

Currently set it to display none but is there another solution that would not get affected when updating?

Thanks