Emails being grouped together in Inbox or Sent folder
Please stop putting all related emails together! It is clunky and very user-unfriendly! Just leave them separated out in their own right. I have accidentally sent myself a reply or having forwarded emails to a third party, then sent an email including the forward, to the original party. It's convoluted and unnecessary. Gives me a headache trying to find parts of a thread!!
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[Deleted User] commented
Try this help article for turning off "conversations" aka threads
https://help.yahoo.com/kb/new-mail-for-desktop/sln28055.html