I've already talked about this last year when Copilot first started appearing in Windows and it could actually change certain system settings. Microsoft's response to my request for more functionality was to scrap that feature entirely in favor of a web app for Copilot, but I think Copilot+ poses a new opportunity for this feature to work even better.
Since Copilot+ is a set of features running locally on your PC, you wouldn't need the internet to process your commands, and rather than depending on the usual Copilot chat interface from the web, this could just be built into a proper part of Windows, such as Search. AI's ability to understand natural language and interpret it could enable users to change really complex settings much more quickly. For example, a user could ask their computer to change the refresh rate instead of going deep into the Settings app to do it. It could change the theme color, disable notifications for an app, and so on.