Disabling Conversation Mode will prevent grouping of emails into threads based on subject. It is highly recommended for groups doing candidate searches. Follow the steps given below to disable Conversation Mode.

Navigate to your group in Google Groups.
Click on Manage located below the Group Title.
Expand the Information menu on the left side of the screen.
Click on Web View Customization.
Uncheck the box next to Conversation mode, labeled Enable grouping of emails into threads based on subject.
Click on the Save button.

The conversation mode for the group has now been disabled.

Browser not supported