I'll be honest that this functionality is confusing and I finally figured out how to use it.
If this feature is switched on, adaptive power saving will never turn on. The user must manually switch Power Savings to 'on' in order for the user to then be promoted to select the apps that should be available when the feature is enabled.
As such, I think this feature should be moved out of this general Power Saving screen. Instead it should display as a separate feature next to Power Saving. Perhaps it should even be a mode that the user can readily turn on or off.
Otherwise, the Adaptive Power Savings feature should be allowed to turn on and readily prompt the user to select specific apps should Maximum power saving be selected beforehand.
Long story short, usability of this feature should be researched further.
