Hello, Kestutis,
Custom CSS code can be used, for example:
.product-details {
display: flex;
flex-direction: column;
}
.product-details .product-title {
order: 1;
}
.product-details .star-rating {
order: 3;
}
.default-add-to-cart-btn {
order: 5;
}
.product-details .price {
order: 4;
}
.product-details .product-excerpt {
order: 2;
}
place the code into Theme Settings > Theme custom CSS > Global.
Kind Regards,
8theme team