How to turn on/off auto power saving mode

[TamRo]

Samsung doesn't have an auto power saving mode on /off option.

To turn on & off Power saving mode automatically, use the Routines feature in Settings > Modes and Routines. Screenshot attached. 

[UserAdik]

Aur sab options hai off kar sakte ho kya baat karte ho

[umesh30]

It's already there as 'Adaptive power saving'. But It only needs to be activated once by manually and this smart feature automatically turn on and off power saving mode based on our usage pattern...
Btw we can turn power saving mode on or off as per our choice and customization via routine as you mentioned above.
I already use this method when battery level goes down below 20% and wifi is on...