For anyone with an ad-free Kindle, and running the most recent firmware, and you're looking for the Display Cover option using Amazon's documentation, and you're not finding it...like me.
It looks like earlier this year they moved the option out of Settings > Device Options and it's now located in Settings > Screen & Brightness. Which ironically doesn't seem to be documented anywhere that I can find.
It looks like earlier this year they moved the option out of Settings > Device Options and it's now located in Settings > Screen & Brightness. Which ironically doesn't seem to be documented anywhere that I can find.