QB Issue Resolution:

In the top area of the send window there is an option to select the from account, assuming you have more than one setup in Apple mail.

Resolution for Issue 'How do I change to default email I sent my invoices from?' available: Yes (Solved).
Source: Intuit Community forum.

How do I change to default email I sent my invoices from?: 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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