Google recently rolled out a new and interesting feature called "Priority Inbox" to all users. The new feature sorts important messages giving you different views so that you can scan all your important messages.
Priority Inbox does not take over your old Inbox and you can easily view the full Inbox by clicking on the Inbox link in the sidebar, however, if you want to disable the Priority Inbox feature in Gmail, you can also do it through the settings.
To disable or turn off in Gmail, visit your settings page (click link to directly go there) and click on the "Priority Inbox" link at the top. Scroll down to the bottom of the page till you see "Show Priority Inbox" and select the radio button next to "Do not show Priority Inbox" and click on the "Save Changes" button.
That’s it, you will no longer be shown the Priority Inbox in Gmail. If you want to enable Priority Inbox, go back to the settings page and click on the radio button next to "Show Priority Inbox".