Hi, if you are in standard mode and you have set the home point i.e you have waited until you get the rapid green flashes before taking off then yes absolutely fly away turn controller off. You will get message on phone stating signal lost then seconds later a symbol returning to home. I tried it several times to give me confidence that it would work and it did. Just make sure you don't gave any tall structures between you and the drone when you do it. In nazam mode you can set the S1 switch for failsafe ie return to home so you don't have to keep turning the controller off.
NB you should only do this as a last resort there are more controllable options available in Nazam mode.