How do I change my Galaxy note 4 screen from black and white to color?

[AC Question]

This is the first time, it just went to black and white and I need to turn display back to color

 

[belodion]

Welcome.

Take a look in Settings, Accessibility...see whether there is a Grayscale setting.
Also, with some phones, that is a battery-saving measure.... check in Settings, Battery.