QB Issue Resolution:

When you have the time costs window up, bottom left is a check mark for do not print all items, uncheck it.  I think it is a sticky setting and if you checked it last time, then next time it remains checksd.

 

To fix a present invocie though, requires that you first delete the billable group from the invoice, you can then check time costs but in my experience they are no longer there.  That means you have to find the bill/purchase transaction and mark them billable again, then use time costs on the invoice

Resolution for Issue 'Billable Expenses Defaulting to “Group” Item on printed version of invoice – How do I undo this?' available: Yes (Solved).
Source: Intuit Community forum.

Billable Expenses Defaulting to “Group” Item on printed version of invoice – How do I undo this?: 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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