Uummmmm… bad advice right there at the end, to a new to be drone flyer! You should never say, nor think about keeping it in sight to begin with, as you stated. There should never be a time when you willfully let it out of your sight, otherwise you are not flying as per FAA regulations. Yes it has happened to us all I suppose, at one time or another, and it must be great fun to go off flying with
goggles on your head and just explore the area, but we must always tell newbies to follow the rules, always. That means don't EVER willfully allow your drone to go off flying out of your sight.