Inbox styles allow you to choose the way in which messages display in your Inbox e.g. to show unread messages first, or important messages first, regardless of whether they have been read or not.
To set the Inbox style:
Click on the Settings cog near the top-right corner of the screen
Under Inbox Type, choose the style you wish to use in the Inbox
The following styles are available:
To set additional style options such as whether message importance icons should display in the Inbox:
Click on the Settings cog in the top-right corner of the screen
Choose See all settings
Click on the Inbox tab on the settings screen
Choose all options as required
Click on Save Changes