How to enable White Text on Black Background(High Contrast) in Series 6 4K UHD TV?

You can change major service screens to White text on a Black background or change the transparent TV menus to opaque so that the text can be more easily read.  

Press Home Button on Samsung Smart Control → Settings → System → Accessibility → High Contrast → On 

Pictorial representation to enable White Text on Black Background (High Contrast) in your TV is as follows:

a). Press the Home Button on your Samsung Smart Control, to access the Home Screen.

b). Using the Directional pad on your remote, navigate to and select Settings.

c). Select System.

d). Select Accessibility.

e). Select High Contrast.

f). Select On to enable this feature.

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