In Chat Plus, you can display [Chat Unread Badge] to users. To display, you have to set these below.
(1) Click on the setting button on the upper right of the management page.
(2) Click on [Chat]>[Design]>[Menu] on the left side of the screen.
(3) Click on [Stand by] tab.
(4) Click on [Detailed Setting].
(5) In the section [Option], check in the box [Display Unread Badge].
(6) Click on [Update].