Extra tokens at end of #endif directive are not allowed. Arudino IDE does not care but Platform IO does. The specification forbids is as well, so adding a comment behind the endif is a good compromise between overview and conformity.
Put FDRS_DEBUG to top
Some formatting and further explanations on the settings.
Uncommented local LoRa settings, so by default the global fdrs settings are taken.
This makes the setup process easier and less error-prone.
Sascha