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Apple's Mail App Finally Lets You Collapse Folder Trees in iOS 15.4 and iPadOS 15.4 « iOS & iPhone :: Gadget Hacks - Techregister
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Apple: Do any iOS Email Clients allow the folders to expand/collapse like Outlook? (2 Solutions!!) - YouTube
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iOS 15.4 Has a Cool Hidden Mail Feature That Helps Clean Up Your Folder Mess « iOS & iPhone :: Gadget Hacks
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