Night mode helps you spare your eyes when reading in the dark. Night mode also makes the screen radiate less light, do not disturb
others in the same dark room.
Also, when the screen is darker, the device consumes less energy - saving battery power, handy for those who likes to read while traveling.
Enable or disable the night mode
Quick way - touching the screen with three fingers, simultaneously or almost simultaneously.
Lucid way - bring up the menu, select "Show", then check/uncheck "Night mode".
Easy way - long touch the menu button in the window header, check/uncheck "Night mode".