Changing the inbox type of your Gmail account allows you to change the way your emails are sorted (Unread first, Important first, Classic inbox, Priority inbox or Classic inbox). The procedure is as follows:
Connect to your Gmail account, click on the small cog icon displayed at the top-right corner of your screen and select Settings:
Go to the Inbox section, click on the drop menu next to Inbox type and make your selection:
Scroll to the bottom of the page and click on Save Changes.