Hello, Eric M Larson
Welcome to Microsoft Community.
I realize that you have encountered a problem that although you have already changed the default local file location and the auto-recovery file location in Options, clicking "This PC" or "Browse" still takes you to the wrong folder. I understand how you feel.
Based on your description, it is possible that you installed Microsoft 365 without completely uninstalling Office 2013. This residual Office 2013 is affecting the settings of your default local file location.
You need to first confirm whether both Office 2013 and Microsoft 365 software coexist on your computer.
Right-click on Windows and select "Installed apps." Check for corresponding entries in the App list.
If you see Office 2013 and Microsoft 365, then you need to uninstall Office 2013.
Feel free to post back if you need further assistance. Let's take it step by step.
Best wishes,
Lucia Wu - MSFT | Microsoft Community Support Specialist