From the proton team:

Hi everyone,

This week, we’re bringing you bulk management of your email on the Mail iOS app.

You no longer need to feel like organizing your inbox is a chore. Now, you can easily label, move, delete, or mark your emails as read with one tap from your Proton Mail iOS app.

If you haven’t already, get the app here: https://apps.apple.com/app/proton-mail-encrypted-email/id979659905.

Thank you for your feedback and support,

The Proton Team