Hi @circuitstar,
Thanks for reaching out.
You are correct that the SKU field is found via the Inventory tab in the Product Data box:
Typically when we see missing settings and issues like these, it is caused by a conflicting plugin or theme installed on the site. In order to troubleshoot this further, would you mind taking the following steps?:
– Temporarily switch to one of our default themes, such as [Storefront](https://woocommerce.com/storefront/), to ensure that this isn’t a theme compatibility issue. Once you switch themes, are you able to find the setting?
– If not and we can rule out the theme compatibility issue, we also recommend deactivating all plugins except for WooCommerce to see if this resolves the issue at that point. If it does, then you would need to activate each plugin, one at a time, to see if you can find the conflicting extension/plugin.
Of course, you’ll want to [backup your site content](https://docs.woocommerce.com/document/backup-wordpress-content/) before making any changes, and you could always [duplicate the site](https://www.ads-software.com/plugins/wp-staging/) for testing purposes if you don’t want to interrupt the live site.
Hope this helps!