Where did the customizable config files go?

In Michael’s 2022 dev con talk he gave several ways to do custom configs using config.xml and other files that seem to be nowhere now (although the screen was blurry and there are no notes with the video). Is there a new file structure or way to do customizations since 2022?

as far i can see there are all still there in C:\Users******\Documents\Mission Planner

Oh, I got it. I was in the program files directory. I must be too tired to continue today! Thanks.

know that feeling to offend i call it a sensor moment