fActivity finish() when fragment exits

How does jetpack's navigation control the return key in the code. For example, I now set app:defaultNavHost="true" in the layout. But a fragment wants to exit the Activity directly. How to achieve it?

    requireActivity().getOnBackPressedDispatcher().addCallback(new OnBackPressedCallback(true) {
            @Override
            public void handleOnBackPressed() {
                requireActivity().finish();
            }
        });