I installed Fiddler Classic some time ago on recommendation from a friend for investigating an issue I was having which has since been resolved,. However I now have a problem where when I close (or even completely uninstall) Fiddler Classic, some apps on my PC (eg. Adobe Creative Cloud and Epic Games) can not access the internet. All other applications (eg. Chrome, Steam, Rambox, etc) still function perfectly fine. Even though this is the case, I have confirmed that the proxy settings are correct (ie. disabled) when Fiddler Classic is not running so I am not sure why this is occuring.
I no longer have a need for Fiddler Classic and I would like to remove it from my PC but this is obviously stopping me from being able to do so. Does anybody have any suggestion?
Maybe you can try starting Fiddler Classic, set the system proxy, then start the applications which have troubles. While they are working, stop Fiddler Classic from capturing, maybe the apps will detect the change and will stop using the proxy.
However, the best solution in this case is to contact the authors of those applications. They should be able to point you where are the cached settings of those apps which are still sending traffic to Fiddler Classic even when it does not act as system proxy (and especially when it is not running).
I've already tried what you have suggested including every iteration of starting/stopping/etc while the applications are open, before they're opened, after they're closed, etc., and including forcing those other applications to use other proxy servers to absolutely no avail. I'd expect, and almost guarantee, that any of those other software authors, when I explain the situation, would point me straight back here.