Hi, @Suzq.

Let me help get this job sorted out for you.

It seems that you've accidentally dragged the job on the left side panel of your Customers & Jobs. This is usually the case if the job becomes the Parent. To restore it back as a job under that specific customer, you can drag it back to its proper place.

Here's how:

1. Go to the Customers menu and click the Customer Center.
2. On the Customers & Jobs folder, locate the job that became the Parent.
3. Click the Diamond shape beside the job and drag it under the correct customer.
4. Once the job is under the customer, click and drag it again to the right side making sure it's aligned to the other jobs. 

If you've somehow made a customer inactive, you can still make it active by clicking the X mark. Just ensure you've filtered the Customer & Jobs folder to All Customers.

This should help sort out your jobs to the correct customer.

Should you need some other references in the future, you can check out the following articles below. The re-sort lists can help if you encounter any data list issues in QuickBooks.

Tracking job costs in QuickBooks Desktop

Re-sort lists

Keep me posted if you have other questions about your customers and jobs. I'm here to help.