How to mark email as "Unread" in Zoho Team Inbox?

How to mark email as "Unread" in Zoho Team Inbox?

We are trying to start using Zoho Team Inbox, but the problem we are facing is that we can't find a way to mark an email as "unread." I know that this is possible in the Team Inbox app, but it appears it isn't possible in the app in the web browser.

Is this hidden somewhere I can't find it or is it just not there?

Having this functionality would be great, as this would mean we can finally migrate to the Team Inbox.