Hello, ProdbyDaan,
Try to add the next code in Theme options > Theme custom CSS:
.woocommerce-table--order-details .wc-item-meta li {
line-height: 2em;
font-size: .95em;
}
.woocommerce-table--order-details .wc-item-meta {
margin-bottom: 0px;
margin-top: 5px;
}
Kind Regards,
8theme team