'Unread' messages first

Is it possible that there is no option to group all unread messages from a given inbox at the top of the list? I can’t imagine that it doesn’t exist, but I cannot find it.


You can choose to sort messages by their read/unread status by simply clicking the envelope icon in one of the columns, this will sort the messages according to whether they are marked as read or not.

I have the same question and have read your reply but I cannot see and envelope icon.
Can you help?