Why did my phone change its colour to black and white?

[AC Question]

My samsung galaxy x6 edge+ changed to its normal coloured to black and white. Why

 

[belodion]

Battery-saving in Settings, Battery? Greyscale in Settings, Accessibility? Reader Mode?

 

[Jewels81]

My samsung galaxy x6 edge+ changed to its normal coloured to black and white. Why

I'm sorry but, you seem to have the worst luck with all your phones.