I understand you have a child theme with a 3rd party theme installed on your site.
Since the changes need to be done in different template files and each theme have their own different way of setup, I’m not 100% sure if what worked for me will work for you as well. However, you can try these codes and see if it works for:
Make sure you have followed the template structure documentation: https://docs.woocommerce.com/document/template-structure/
In your child-theme wp-content/themes/yourtheme/woocommerce/single-product/ paste the meta.php
and ‘title.php’ files from WooCommerce core files.
From the meta.php file remove the section where SKU is declared or called. Here is the line of codes from meta.php
<?php if ( wc_product_sku_enabled() && ( $product->get_sku() || $product->is_type( 'variable' ) ) ) : ?>
<span class="sku_wrapper"><?php esc_html_e( 'SKU:', 'woocommerce' ); ?> <span class="sku"><?php echo ( $sku = $product->get_sku() ) ? $sku : esc_html__( 'N/A', 'woocommerce' ); ?></span></span>
<?php endif; ?>
Here is the screenshot of how my customized title.php looks: https://d.pr/i/nDnXJC
And this is how my product page looks: https://d.pr/i/T7CnRf
If you need further help with customization. We highly recommend contacting one of the services on our Customizations page (https://woocommerce.com/customizations/)