Yes, you're right, lmbart. I've come to share information to help clear some of your confusion.

When rehiring an employee in QuickBooks Desktop, you'll want to ensure all data entered from the Termination tab of your employee's profile are cleared out. This will help reinstate your terminated employee from your file. Then, enter the recent rehired date for the employee from the Hire date field, and keep the Original Hired date section as this states the original date when your employee was originally hired for the first time.

To do that:

1. Go to Employees in the menu bar at the top, then to Employee Center.
2. Choose the employee and open their profile.
3. In the Edit Employee window, remove the checkmark from Employee is Inactive.
4. Select the Employment Information menu and select the Termination tab.
5. Remove all the termination details.
6. Select Ok to save the updated information.

However, if the Hire date field is still greyed out after ensuring the steps above, you'll want to consider using the QuickBooks Tool Hub to resolve common issues and errors in your desktop file. Beforehand, let's ensure you've downloaded your QuickBooks Desktop account to its latest release. 

Once done, we can now download and install QuickBooks Tool Hub. Here's how:

1. Close your QBDT.
2. Download the most recent version of the QuickBooks Tool Hub.
3. Open the file you downloaded (QuickBooksToolHub.exe).
4. Follow the on-screen steps to install and agree to the terms and conditions.
5. Once done, double-click the icon on your Windows desktop to access the tool hub.

For additional information, you can check out this reference: Fix common problems and errors with the QuickBooks Desktop Tool Hub.

I'm also sharing this helpful resource to help you invite your employee to access their pay stubs and W2s: Invite your employees to QuickBooks Workforce to see pay stubs and W-2s if you use QuickBooks Deskto.... You'll need to make sure the employee is active before inviting them.

Let us know how things worked for you, lmbart. If you require additional assistance with any other area, please don't hesitate to reply in the comments below. We'll be around to help you further. Have a good one!