Hello,

You need to launch WooCommerce Setup Wizard more details here https://docs.woocommerce.com/document/woocommerce-setup-wizard/

Please find here information on how to create menu https://xtemos.com/docs/basel/create-menu/

You can see there HTML block ID in Description field this block creates a mega menu if you want to create the same read this tutorial how to do that https://xtemos.com/docs/basel/html-blocks/

Best Regards