QB Issue Resolution:

ou can not, it is one more issue with QBO

You will have to experiment with reporting on item sales and customizing a report to show only non taxable sales, and use that report in addition to the sales tax report

gear>feedback and report/suggest it to the developers

Resolution for Issue 'Why doesn’t sales tax report show a non taxable sales summary?' available: Yes (Solved).
Source: Intuit Community forum.

Why doesn’t sales tax report show a non taxable sales summary?: 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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