Unified Inbox / All Inboxes on Mobile App with Multiple Accounts
This feature is available in almost every other mail client in existence on either mobile or desktop.
If we have multiple mailboxes there is an option to see a unified Inbox on the Mobile App without needing to switch between accounts.
This can also apply to sent items.
I would allow the user to customise which accounts feature in the "All Inboxes"
Furthermore although this might belong in a separate feature request. It would be very helpful to be able to disable certain e-mail addresses in the same way we can using the Proton Mail Bridge "Split Addresses" feature.
Thanks.

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ohoh commented
Not sure there should be a high priority on this, since you can use multiple aliases with one account and this would allow having multiple accounts in one inbox circumventing the limit of free accounts towards paid options.
Although I do think that current handling of aliases is not helpful and there should be an option to merge proton accounts. -
Alex commented
Currently with multiple Proton accounts added to the mobile app, the user must switch profiles to view the inbox's of each account.
A unified inbox would allow us to view the e-mails in the inboxes of all the accounts added from one view.To enhance this feature the same can be done for sent items and you could allow the user to select which accounts or e-mail addresses to include in the unified inbox.