By default, Gmail shows the most recent message in a conversation at the bottom of the thread. If you want to see new messages at the top of the thread, you can install an extension from the Chrome Web Store.
Reverse messages in a conversation thread
- Open the Chrome Web Store.
- On the left, in the search box, enter a search term, such as Gmail reverse conversation.
- When you find the extension that you want, click Add to Chrome. Some extensions might need certain permissions or data.
- Click Add extension to confirm.