I downloaded some extension (sorry, forgot which) and it changed the way the left pane looks like. Instead of each email separate, each with a sub-category of Inbox, Drafts, Sent, etc., now all the Inboxes are grouped under one category, each "Sent" under another, etc. So it changed from the first picture (or similar to it since I got that pic off the internet), to the second Please how do I revert it so that each individual email has its own Inbox, Sent, etc. separate from another email's?