product description – size

It may be possible to change the layout with some custom css. Please post the url to a relevant page so the markup can be examined with browser tools.

Try this custom css:

@media only screen and (min-width: 1024px) {
  body.woocommerce div.product .woocommerce-tabs,
  body.woocommerce-page div.product .woocommerce-tabs,
  body.woocommerce #content div.product .woocommerce-tabs,
  body.woocommerce-page #content div.product .woocommerce-tabs {
    max-width: 100%;
  }
}