If I do not have the "smart go home", button pushed where it is green in my app, does that I mean I have turned off all the capabilities of my return home functions for the phantom?  So if I lose signal or manually push the RTH on the controller, it will not return home unless it is on in the app?  Sorry, I am a newbie and it seems straight forward, but I don't want to assume anything. Thanks for any feedback!!

When you disable that all your RTH functions will work except low battery RTH. Normally the system knows how much battery it takes to come back to you (except wind)  bygreen/yellow/red bar on top of your screen.
With the low battery RTH disabled, it will not automatically go to RTH mode but it will let you fly wherever you are until you run out of battery and it will land wherever it is.

When you disable that all your RTH functions will work except low battery RTH. Normally the system knows how much battery it takes to come back to you (except wind)  bygreen/yellow/red bar on top of your screen.
With the low battery RTH disabled, it will not automatically go to RTH mode but it will let you fly wherever you are until you run out of battery and it will land wherever it is.

Thanks Ken, helps a lot. Sounds like I should keep it on unless I am inside.  I would hate to have it return to home if I have a low battery while messing around with it in the house.