Whenever inexplicable issues present themselves “out of the blue” and with seemingly no reason, I always try "repair installs" or repair utilities, and the ordering depends on what I suspect is the most likely culprit.

In a case like this, my order would be:
1.  Using DISM (Deployment Imaging Servicing and Management) and SFC (System File Checker) to Repair Windows 8.1, 10 & 11.  This allows you to rule out quite a few potential issues with Windows itself with very minimal effort, and not too terribly much time involved.

2. Following The Most Basic Troubleshooting Steps for Suspected NVDA Issues.  This lets you rule out add-ons, among a couple of other things.

3. Uninstalling NVDA completely and reinstalling it.

4. Repairing Office:  Repair a Microsoft 365 application - support.microsoft.com

Brian - Windows 10, 64-Bit, Version 21H2, Build 19044  

It is well to open one's mind but only as a preliminary to closing it . . . for the supreme act of judgment and selection.

       ~ Irving Babbitt