sub-folders
ProtonMail must add a feature to set sub-folders into other folders; this is an indispensable feature for any top tier email provider ....

The new Protonmail now includes the ability to create folders and subfolders. Give it a try today at mail.protonmail.com
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Chris commented
you can manage this with labels/folders by using a prefix to simulate a "directory". I do this to order/organise sub-context of a main topic.
The only 'feature' of nested folders this doesn't give you is the ability to collapse. That's it!
I'd rather the devs work on their values for this product than overhaul/rework/refactor for such a tiny benefit (collapsible folder/label.. not worth it..) -
Anonymous commented
Need the ability to have nested folders to allow for better email management.