I can't find "Xcode Source Editor" in my Settings app under "Extensions"

[Jeehut]

I have installed the RemafoX app and after setting up the project, in the config files' "Quick Actions" pane, I'm asked to "Integrate RemafoX with Xcode", but I can't follow the steps for "System Preferences" because I can't see the entry mentioned in step 3:

The "Extensions" setting in the System Preferences app for me looks like this, there's no "Xcode Source Editor" entry:

What should I do?

[Jeehut]

Unfortunately, the Xcode Source Editor functionality isn't as reliable as it could be. Hopefully, Apple will fix it sometime in the future.

But here are some workarounds that can help fix the issue:

1. Open the Applications folder and rename Xcode to something else and then back to Xcode or simply move Xcode out of the Applications folder and back in – this is the most common fix (see here).
2. If you're using the Xcodes app to manage your Xcode versions, turn on the "Always rename to Xcode.app" option for the active/selected Xcode version in the app's settings' "Advanced" tab.
3. If you develop an app with an Xcode Source Editor extension yourself, Xcode might get confused by its build artifacts. In this case just delete the DerivedData folder, e.g. by running rm -rf ~/Library/Developer/Xcode/DerivedData in Terminal, then try the first tip above.
4. Delete Xcode and re-install it from the App Store.