The count in the inbox doesn't gets refreshed as you delete the mails or read emails. You have to refresh the whole page to get the count which is really annoying.
The Dark Theme is not working on your very own edge Browser which is really hard to understand.
Martina Babiakova commented
I noticed in the new layout that when I click on new emails and read them, then return to the main mail list, the bold number beside "Inbox" on the left still doesn't go down. It doesn't recognize that I've read an email and remove it from that notification area.