Proton Mail appears to show an unhelpful, distracting value in brackets. Unread messages occurring in an email conversation chain show "[T]" where T is the total email count. That's not a particularly helpful value. Intuitively, many users would assume such a number indicates the unread count. So the total makes it look like a storm of fresh, new emails have been queued.

Please update the formatting in the inbox list of conversations view to show the unread count not the total count.