Samsung Galaxy Note 4 - Manual (Page 37)

Basics
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Read the on-screen information about the mode and tap Enable.
To deactivate ultra power saving mode, tap → Disable ultra power saving mode →
Disable.
The estimated maximum standby time shows the time remaining before the battery
power runs out if the device is not used. Standby time may vary depending on your
device settings and operating conditions.
Viewing help information
To view help information to learn how to use the device and apps, open the All apps screen
and tap Settings
→ Help.
To view help information for an app while you are using the app, tap → Help.
Some apps may not include help information.