Microsoft 365 Roadmap
RM563807Outlook: Choose to Show Unread or Total Count for Each Folder
Summary
You can now pick whether each folder in your folder pane shows the unread count or the total item count. Until now, Outlook only displayed unread counts, but sometimes you need to see how many items are in a folder overall. Just right-click any folder and choose whether to show the total or unread count. It gives you more control over how you keep track of your email without changing how anything else works. #newoutlookforwindows