QB Issue Resolution:

Go to File > Print Forms > Invoices or File > Send Forms and you’ll see them listed there.

Resolution for Issue 'How do I find invoices that I have marked print or Email later?' available: Yes (Solved).
Source: Intuit Community forum.

How do I find invoices that I have marked print or Email later?: 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.

Support for Invoice Email Later
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Error Recovery for Invoice Email Later [Canada]
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