Your persistence in seeking support is valued, @nic32. As a fellow QuickBooks user, I recognize your frustration, especially when managing sales items. Let me provide some relevant information about the product and services bundle feature in QuickBooks Online (QBO) that will help address your concerns.
In QBO, when you uncheck the Display bundle items when printing or sending transactions option, individual bundle components won't appear on customer invoices or estimates. However, while working in the Invoice or Estimate tab, you'll still see bundled items for your reference.
If you've unchecked the display bundle items option, we assure you that bundled items will be hidden from your customers' view when you finalize and send an invoice or estimate. The system confirms this with the message: Your customer won't see any items in this bundle.
Moreover, you can verify this by clicking the Print or Preview feature to see what your customers will receive. Refer to the screenshot below for reference:

For additional guides while managing your products/services, feel free to open these resources below:
For future reference, visit these resources to keep track, get better insights, and for a comprehensive overview of your sales data: Use reports to see your sales and stock status in QBO.
If you have any questions about the QBO bundle feature, please don't hesitate to ask the Community space, @nic32. We're always here to help you out!