The Conversation View feature in Gmail enables users to choose whether replies to emails are to be grouped in conversations or if each email should show up separately in the inbox. Follow the steps given below turn on/off conversation view.
Open Gmail and click on the Settings icon located on the top right of the screen. The will open a drop down menu.
Click on Settings.
On the General Settings page scroll down to the section titled, Conversation View.
a. To group messages select Conversation view on.
b. To un-group messages select Conversation view off.
4. After making the necessary changes click Save Changes on the bottom of the screen.