Search function not working in Calendar and Mail

The Search function has stopped working for me in Calendar and Mail. It actually stopped working in Monterey but try as I could I couldn’t find a solution so I was hoping my upgrading to Ventura would fix the problem. It hasn’t. Not having the search functionality in these apps is extremely frustrating.

The Problem: Entering search criteria (anything at all, actually) in the Calendar or Mail search box yields no results.

The Situation: 27” 2017 iMac, Ventura 13.4

Actions Taken at Various Times:

1. Settings/Siri & Spotlight: All boxes are checked; Spotlight Privacy contains only one location (Time Machine drive)

2. Shut down and restarted Mac multiple times

3. Relaunched Mail and Calendar multiple times

4. Disabled and re-enabled my Mail account

5. Rebuilt Spotlight index multiple times for Calendar and Mail as per Apple Support instructions

6. Relaunched Mail by holding down the Shift key

7. Booted into Safe Mode where search still doesn't not work

8. Reinstalled Ventura

Can anyone suggest anything new I might try?