Solved! Go to Solution.
Also, you can use bixby routines to automatically switch between power modes.
The new UI for power saving. To learn more, tap on the button name ("Power saving mode") and then tap "details". Here you can choose your preferences. To get the maximum saving, toggle ON all the available options. (Or goto, Settings > Battery and device care > Battery > Power saving mode). However you can use bixby routines to automatically switch between power modes.
Hope that helps!
(First you have to turn off powersaving mode to make these changes)