sort folders without going to settings
On the Proton Mail inbox (https://mail.proton.me/u/5/inbox) scroll down to 'Folders':
Add a sort button right next to the + (add folder) button and before the gear (settings) button. This would eliminate the need to load another page to sort the folders and then reload the inbox page.
Also, as others have recommended, allow the subfolders to be sorted alphabetically.
Optionally, allow the folders to be sorted when they are created
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Julia
commented
This is critical! Simply allow users to drag folders into a different order and be nested, just like in Outlook or Apple Mail or any other mail client, and ensure this can be synced across devices. Otherwise, it takes so much time to go into Settings each time, and to keep an organized inbox for shifting needs.