Threaded email is a feature GMail popularized making their service standout from other email service competitors. Similar to the idea of forums, newsgroups, etc., this feature groups email messages together keeping the conversation/topic intact. This also makes your inbox organized. Some were able to embrace the idea but there other are users who prefer the old style of listing emails messages. If you prefer the traditional email style, read on to unthread your GMail.
On your GMail page, click Settings then look for “Conversation view” part. Tick/Select “Conversation view off” to disable the feature. Click the Save Changes button at the bottom of the settings page.