Hi cj, thanks for asking. What you’re after is a different “Order Items Formatting” option and there’s one just waiting for you to use.
From the WooCommerce > Store Export > Quick Export screen click the Orders export type then scroll down to Export Options and find the “Order Items Formatting” option, hit the “Place each Order Item within their own Order row” radio button and then the Export button. You can set the same from the Edit Scheduled Export screen for Scheduled Exports. 🙂
(“Place each Order Item within their own Order row” is my favorite Order Items Formatting method but we provide a few options for different store needs)