Problem: When people reply to an email, Gmail groups responses together in conversations with the newest email on the bottom.
Note: A conversation breaks off into a new conversation if the subject line changes or the conversation gets to more than 100 emails.
How to stop Gmail from grouping emails together
1. Open Gmail.
2. In the top right you will see a gear like icon. Click that icon, click Settings Settings.
3. Click Settings.
4. Scroll down to the “Conversation View” section.
Select Conversation view on (messages will be grouped)
Conversation view off (messages won’t be grouped).
5. At the bottom of the page, click Save Changes.