If you want to remove Up sales product: https://prnt.sc/1g7kz27, please use this code:
remove_action('woocommerce_after_single_product_summary', 'woocommerce_upsell_display');
If you want to remove Related products: https://prnt.sc/1g7lhvy, please use this code:
remove_action('woocommerce_after_single_product_summary', 'woocommerce_output_related_products');