No more CBR option in Bit rate Mode or Bit rate Encoding ?!

Hi, there is no more VBR or CBR options in media encoder cc2018 ?!
There is just a box for limiting the data bit rate to what you want, but when analyzing the file, it is still vbr...
One client still tell us that our new files aren't cbr.

Is there a bug or a new place for this setting  ?
Can't seems to write directly to some support to Adobe, it keeps giving the options of forums or faq... doesn't help at all.