No clue why they disappeared. How do I retrieve them and put them to left of all my emails?
Look at the bottom left and you should see the word "Show". Click on that and you should see your folders again.
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Re: How to I get my folders back like INBOX, SENT, SPAM, ETC.
For reference: see the "Where did my folders and search go?" link under the "Using Email" heading at https://connect.xfinity.com/faq/email.html. Be sure to read down the page to the "Hide Folders" and "Show Folders" items.