I've got a co-worker in our group that sits one section over from the rest of the group. We're in an open office (ugh, I know) and so it is easy to have quick 1:1 conversations (work, and non-work related). But at the same time voices travel and people nearby can catch most of what we say.
The separate co-worker often likes to jump in at the tail-end of a conversation and wants to be included. This is often after the conversation has run its course and a decision has been made.
How do I politely say what I want to say: "We got this. I don't want to replay the whole conversation for you when it doesn't involve you." Or is this just another bad part of working in an open-office?
I do want to say that when I do want their input/opinion, I'm sure to include them and they contributes valuably.