How to turn power saving mode on and off on my Sony Xperia XA

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STAMINA mode (power saving mode) optimizes the battery life on your Sony Xperia XA. When the screen is off, your phone will save power by lowering the screen brightness, turning off haptic feedback and limiting the phone's performance. You will still receive messages and notifications.
1. Touch Apps.
2. Touch Settings.
3. Scroll to and touch Battery.
4. Touch STAMINA mode (or touch Ultra STAMINA mode to get even more life out of your battery).
5. Touch Always on.
6. STAMINA mode is now on. To turn it off, change the setting to Never.