Gmail: Reverse Conversation Extension puts the most recent email in a conversation at the top. This will also move the reply button from the bottom of a conversation to the top. To reverse the flow of the conversation, you must add an extension to Chrome. (Note: this is different than the most recently received email being at the top of your inbox.)
To add the extension:
- Open the webpage in the Chrome Web Store.
- Select Add to Chrome. (You may have to grant permission to the extension.)
- When you close and reopen your Gmail the order of the emails within a conversation will be reversed. You may have to refresh Gmail to see the change.