Thank you for letting me know.
The reason I mentioned you can uninstall it in "Installed app" in my previous steps is because, in the newer versions of Windows 11 (23H2 and 24H2), Copilot is now a standalone app that can be uninstalled. Once removed, the Windows + C shortcut should no longer open it,,, unless you're using an older version of Windows.
Could you provide me with a screenshot of your current Windows OS Build?
To do this, press the Windows key + R to open the Run dialog, type "winver" (without the quotes), and capture a screenshot (make sure not to include your email address), and attach the screenshot in your next response.
As for Copilot in Microsoft Edge, it's integrated into the search experience, but you can disable the Copilot sidebar by going to: edge://settings/sidebar