If I remember correctly, the new platform only allows the changes you can see when you go to My Profile. Your Community Profile contains 4 categories which are viewable by anyone. Account Details just pertains to some personal information which is not viewable to others using the forum...probably just Admins, and maybe Mod Staff.
Anyway, I don't think you can make any change to that yourself. Maybe if a Moderator isn't too busy, you may be able to request that it be deleted from your profile?
Just a thought...lots of changes here, so take your time to get back in the swing of things...we're all having to learn the ins and outs, it just take a little patience.
You may want to check out the forum related issues threads...lots of discussion over the new forum platform, and current issues which are being looked into, in case you experience any problems which this can walk you through.
Hang in there!