I started attending in the early 1960s and never recall any such identification or designated areas.
A large number of DF'd and DA'd persons clearly identified as such and sitting in one area, would likely make an unwanted statement to the other attendees.
With regards to DF'd persons speaking with one another, I believe WT continues to prohibit such activity. Of course, unless the person wishes to be reinstated, why would a DF'd person care what WT prohibits.
I have heard where a DF'd person was pulled aside by an elder and 'counselled' against speaking with another DF'd person. The DF'd person's response was WT's rules are for JWs in good standing so he can speak with anyone he wishes.