It is disabled because Microsoft has restricted the user to uninstall the Microsoft inbuilt apps easily.
Fortunately,there is a way to uninstall/reinstall the Microsoft camera appin windows 10 throughPowershellcommand prompt.
After uninstall, it’s possible for you to easily reinstall it from the Microsoft app store.
Before reinstalling the camera app, we suggest toreset the Microsoft camera appto its factory prefs.
