Note that if you have Add bundle items as separate line items to orders? app setting disabled, then this help article is not applicable to you.

By default, the dummy bundle product and its bundle items are individually displayed on the Order Printer Pro receipts / invoices.

Merchants may choose to hide the bundle items from these receipts / invoices for operational purposes.

Open the Order Printer Pro app and go to the Manage Templates tab.

Find Receipt / Invoice template and click Edit template.

Search for the below code snippet in your template:

for line_item in line_items