Default [Q] 'Clear' Button from Notification dropdown missing

When I receive a notification of any kind there used to be a clear button.. As of last night it has gone missing. I'm running alliance ROM build 25. Clean installed. I know I could just use to aosp clear button...but I don't like it. Maybe I disabled it tinkering with all these options and now cannot find it again. Can someone maybe point me to the right direction to find it again? I should also say that I flashed black glass theme from the ota installer. But the clear button was there before and after flashing it. Any help you be very much appreciated.