Tip:
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Swipe down from the notifications bar, tap the "Settings" icon
Tap "Power management"
Tap "STAMINA mode"
Slide the switch on the top-right corner to enable/disable Stamina Mode
Tap "Activate" to confirm
Tap "Add applications"
Tap the checkbox beside the application you want to keep active in stamina mode
Tap "Done"
Tap the "Cross" icon beside the apps to delete it
Slide the switch on the top-right corner to enable/disable Stamina Mode