Other questions

Hello there, @Amanda301. I'm here to help you permanently delete the customer data in QuickBooks Desktop (QBDT).

In QBDT, the customer will be deleted instantly once you clicked the Delete Customer: Job option. However, the option will only be applicable if there are no transactions assigned to the name. If there are entries allocated for them, the system will ask you to make them inactive instead (please see the snip below). This may be the reason you're seeing an X icon next to their name. 

Also, the option to delete customers with sub-items is unavailable. You'll receive this warning:

I'll include this article to give you an additional guide in managing the item list in QBDT: Add, edit, and delete items.

I'm always here ready to lend a hand if you have any other concerns about managing your customer's data in QBDT, please don't hesitate to add a comment below. I'm just around the corner to help. Have a good one and stay safe.