In some email clients I have seen in my opinion a useful feature:Double-click on the Inbox (or any other section) to show only unread messages in the folder, click to toggle the display (all / only unread)
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Hello
@QwerProd wrote:(or any other section)
(or any other section)
Have you tried Quick Filter Toolbarhttps://support.mozilla.org/en-US/kb/quick-filter-toolbar
never-displayed