Where is the Doze feature on Android?

[AC Question]

I've seen on a lot of threads about accessing or turning on doze feature, some can't find it at all or think it's not on their phone. For my Sprint s7 edge, if you go to settings...scroll down to accessibility section...scroll down to services... Doze feature has a button to turn it on. Have not really compared battery life...but just giving the info.