How to search products & product SKU?
WooCommerce - How to search products & product SKU
Regular Engine
To search product SKUs, select the “_sku” custom field on the General Options -> Sources
panel, on the search instance options:

Index Table Engine
Select the “_sku” custom field on the General
panel:

Note
Make sure you have the product custom post type selected as well with the Search in custom post types option:

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