Hello,
Please add this code in custom css:
.fixed-content {
display: -webkit-box;
display: -webkit-flex;
display: -ms-flexbox;
display: flex;
-webkit-box-orient: vertical;
-webkit-box-direction: normal;
-webkit-flex-flow: column;
-ms-flex-flow: column;
flex-flow: column;
}
.product-information .title, .product-info-wrapper .title, .product-summary-center .title, .product-information .product_title, .product-info-wrapper .product_title, .product-summary-center .product_title,
.product-information .price, .product-info-wrapper .price, .product-summary-center .price,
.product-information .products-page-cats, .product-info-wrapper .products-page-cats, .product-summary-center .products-page-cats {
-webkit-box-ordinal-group: 0;
-webkit-order: -1;
-ms-flex-order: -1;
order: -1;
}
.product-information .product_meta, .product-info-wrapper .product_meta, .product-summary-center .product_meta {
margin-bottom: 0;
}
Also, about the count of related products on single product page, you may change this via Theme Options https://prnt.sc/idzxlp instead of file editing.
Regards