ACO classifications in Opening Explorer?

I tried using Opening Explorer in v3, and the ACO classifications no longer show up on the main screen, or the page for each opening line. Is there a reason why this was removed?

ACO? 

Do you mean ECO?

Weird, I just checked the Opening Explorer in v3 and found the ECO code hidden in the address. 

I tried the Najdorf Sicilian. You can find he ECO code in the link, but I didn't see it listed anywhere on the page. 

https://www.chess.com/openings/B90_Sicilian_Defense_Open_Najdorf_Variation

Yes. Oops 

Yeah, it's in the address bar, but that's the only place I can find it, and it used to be just in plain sight.

I only noticed this because I was entering a game into my database that I played 6 months ago; I always use the Explorer to categorise the ECO codes, just struck me as odd that it isn't being shown anymore.

Here: http://i.imgur.com/8JtjDNI.png ?

Erik, that's the English name, not the ECO code for the opening. Where in the image is "B90"?

Above two posts, exactly. That is where it used to be in v2 (I think, iirc), and SmyslovFan is right that it isn't there anymore. The link address has it in, but it is not shown anywhere on the page.

Ah right. You can click through to get there. But we have found that most people don't use the codes for anything anymore. What is your usecase for knowing the CODE?

I put the ECO in my PGN databases, so in future if I wanted to, I could look at my games per each opening line and see where my strengths lie (I only have 16 games over 13 months in there, so it isn't too much use for now).

I could get them some other way, but it would be nice to keep it integrated into explorer (maybe an option to toggle it on/off?).

I use ECO codes quite a bit. While ECO has its limitations, it is generally more specific and easier for discussing chess with people from different cultures. 

@ThomasJEvans You probably know this already, but when you download/share a PGN from here, it already comes with the ECO. (And most database tools I have used automatically add the ECO to games when you enter them as well.)