QB Issue Resolution:

The Customer Name, at the top, is a label field. Then, you enter Mr or Mrs, First, Middle Initial, Last, Company Name, etc.

At the Customer Name field, this is where you enter it how you want to see it in reports and on the customer center list.

Resolution for Issue 'How can I sort and show customers by last name first?' available: Yes (Solved).
Source: Intuit Community forum.

How can I sort and show customers by last name first?: 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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