How to turn off the Galaxy S6 and S6 edge capacitive keys backlighting

Bright navigational keys backlighting can be pretty annoying, especially at night, and especially if there is no option to adjust the light intensity or, at least, duration. Heck, on most Galaxy S6 and S6 edge models you can't even turn those off, it seems.

Yep, Samsung has somehow missed including a separate option to adjust the touch keys backlight with the new flagships, except on the AT&T version, which, as usual, has its own categorized settings menu.

The Galaxy S5 has this feature tucked in the display settings options, but now, on the S6, there is ...