Hey Again,

Add this into the Custom CSS box located in your Salient Options panel (All custom css provided is tested in the Live Browser so it will work as intended . If you cant see any changes make sure there is no red cross in the Custom CSS Box as that syntax error would cause all css below it to not show up on the Frontend):

@media only screen and (max-width: 999px) and (min-width: 1px) {
    .woocommerce-page .related ul.products li.product {
        display: none !important;
    }
    .woocommerce-page .related ul.products li.product:nth-child(1) , .woocommerce-page .related ul.products li.product:nth-child(2) {
        display: block !important;
    }
}

Thanks

Where can i see the upsell products. Could you provide a page url ? 

Add this into the Custom CSS box located in your Salient Options panel (All custom css provided is tested in the Live Browser so it will work as intended . If you cant see any changes make sure there is no red cross in the Custom CSS Box as that syntax error would cause all css below it to not show up on the Frontend):

@media only screen and (min-width: 1000px) {
   .woocommerce .products.related .product:last-child {
        display:none !important;
    }
}

Thanks

Add this into the Custom CSS box located in your Salient Options panel (All custom css provided is tested in the Live Browser so it will work as intended . If you cant see any changes make sure there is no red cross in the Custom CSS Box as that syntax error would cause all css below it to not show up on the Frontend):

/* hide 4th upsell on desktop */
@media only screen and (min-width: 1000px) {
    .woocommerce .products.upsells .product:nth-child(4) {
        display:none !important;
    }
}
/* hide 3rd and 4th on mobile */
@media only screen and (max-width: 999px) and (min-width: 1px) {
    .woocommerce-page .upsells ul.products li.product:nth-child(3) , .woocommerce-page .upsells ul.products li.product:nth-child(4) {
        display: none !important;
    }
}

Thanks

Add this into the Custom CSS box located in your Salient Options panel (All custom css provided is tested in the Live Browser so it will work as intended . If you cant see any changes make sure there is no red cross in the Custom CSS Box as that syntax error would cause all css below it to not show up on the Frontend):

@media only screen and (min-width: 1000px) {
    .woocommerce .products.related .product, .woocommerce .products.upsells .product {
        width: 31% !important;
    }
}
@media only screen and (max-width: 1000px) {
    .woocommerce .products.related .product, .woocommerce .products.upsells .product {
        width: 48% !important;
    }
}

Thanks