My artboard name/number label disappeared.

My computer is Windows 10 and i use latest version of Illustrator CC now.
There should be an label on upper left side of artboard that shows artboard's number/name,
and X label on upper right side of artboard. But nothing shows in my Illustrator.
I tried everything to solve this problem.
I uninstalled and redownloaded Illustrator countless times, restarted computer, found AIPrefs file and removed it.
But nothing worked. I did all of solutions exist in internet.
What should I do?
