QB Issue Resolution:

in QBO that is not an option intuit seems to feel that classes are an internal accounting control and should not be printed

gear>your company>feedback and report/suggest it to the developers

Resolution for Issue 'I have classes enabled in QB online, and can select them per line item when creating an invoice. They won’t display on the printed invoice, however – how do I do that?' available: Yes (Solved).
Source: Intuit Community forum.

I have classes enabled in QB online, and can select them per line item when creating an invoice. They won’t display on the printed invoice, however – how do I do that?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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