Vanguard Brokerage account suddenly changed from Complete to Simple tracking

I'm using Quicken Classic Deluxe (version R63.21) on my Windows 11 PC. My last download from my brokerage account at Vanguard unexpectedly switched to the Simple (positions only) tracking method from the more detailed Complete (positions and transactions) method.

When I go to Tools/Account list/Account details to change the tracking method, I see a pop-up that says "Vanguard uses Express Web Connect (EWC) to connect to Quicken which means only the Simple Investing tracking method is available". How do I go back to the Complete tracking method?

Some background: I've been plagued by the "OL-220-A" download errors on my Fidelity brokerage account for many months. Works perfectly fine one day, and then doesn't for several weeks at a time. After reviewing the helpful suggestions on the support forum (https://community.quicken.com/discussion/7960748/fidelity-update-error-ol-220-a), and suspecting data file corruption issues, I went ahead and created a copy file. I then reconnected my Fidelity online service and the transaction details downloaded just fine. Thrilled, I was happily going about reconnecting online services for all the other accounts on this copied file, until I hit this issue with Vanguard.

I feel like I'm this close to making the copied file my primary file if only this Vanguard issue could be solved!