When replying to email it is only copying the most recent response in the conversation into the content, not the entire conversation history. The email I am replying to does include the entire conversation.

Have been using Thunderbird for years, this only just started happening today. So my assumption is something inadvertently got changed in my settings. But I am not able to find a setting for this. Closest I can find is in Account Setting -> Composition & Addressing, there is setting for "Automatically quote the original message when replying" (which is selected). But there is no setting I can find for "Quote only most recent entry...not the entire contents of the message"