iCloud email
How can I stop iCloud emails from grouping into threads? I had fixed this before, but during one of the updates, it reverted back to grouping the emails that were related. And now the settings don’t included the “unthread” option.
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See the article View email conversations in Mail on Mac - Apple Support
Tip: It’s easy to turn conversations on or off. In Mail, choose View > Organize by Conversation (a checkmark shows it’s on).