This is highly annoying and needs a workaround to view only unread messages in any Gmail account:
- Type “is:unread” (not including the quotation marks) in the Gmail search field.
- Click Search Mail.
As a shortcut you can use “l:unread” or even “l:^u” instead of “is:unread” (or “label:unread“).
Don’t forget you can combine this search for unread messages with others like this:
- “l:^u from:karl” finds all unread messages from “karl”,
- “l:^u l:^t” finds all unread starred mail, and
- “l:^u l:^k subject:invoice” finds all unread messages with the word “invoice” in the subject that are in the Trash.