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To enable Read mode for certain apps: 
1. Open Settings and touch Display > Read mode. 
2. Switch on Custom apps and ensure that For entire device 
is turned off. 
3. Touch Add apps to this mode.  
4.  Select the apps you want to use in Read mode and touch ADD. 
Using Night Light 
You can enable Night Light to tint the screen amber and reduce 
the intensity of bright colours for eye protection, or set a schedule 
when Night Light will be turned on. 
1. Open Settings and touch Display > Night Light. 
2. Switch on Turn on now to enable Night Light. 
- or - 
If you want to set a schedule when Night Light will be turned 
on automatically, touch Turn on automatically to enable 
automatic Night Light and select an option. 
3.  Drag the sliders below Intensity of filter to adjust the eye 
protection effect when Night Light is on. 
Enabling Full-Screen Display 
If an app cannot automatically adapt to display in full screen, you 
can switch on the full-screen display option to make it fit the 
screen.