This is not possible out the box, you’d need to modify the CSS by adding this to your Theme Options => Custom CSS
.woocommerce div.product .woocommerce-tabs ul.tabs li {
margin: 0 30px -2px 0!important;
border: 0;
width: initial;
}
.woocommerce div.product .woocommerce-tabs ul.tabs li a {
max-width: inherit;
}
.woocommerce div.product .woocommerce-tabs .panel {
width: 100%;
border-left: none;
}
.woocommerce div.product .woocommerce-tabs ul.tabs {
border-bottom: 2px solid #e3e3e3;
}
.woocommerce div.product .woocommerce-tabs ul.tabs li.active a:after {
display: none;
}