you have to do it one by one, or you can try bringing up an invoice per customer, then click time costs, on each tab select any costs that show as billable and click the hide column for each – that sets them to unbillable (why it is called hide […]

Resolution for 'checked on issue: 'Can I turn off ‘billable’ being auto checked on previously printed checks?' available: Yes.

The checked on 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 checked on issue yourself by looking for a resolution described in the article. If it is a complex checked on issue or you are unable to solve the issue, you may contact us by clicking here or by using other checked on support options.

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