Proton Mail’s iPadOS app should adopt an adaptive split‑view layout that takes advantage of the device’s wider screen: a fixed‑width left column for folders and the message list, a flexible central pane that previews the selected email, and an optional right pane for contextual content such as thread history or attachment previews. This layout mirrors the familiar two‑column designs of Apple Mail and Outlook, reduces vertical scrolling.

By implementing responsive spacing, larger typography, and split‑view states, the app will feel more native on iPad (currently it just feels like using a big iPhone app on the iPad screen, improve workflow efficiency, and align Proton’s UI with modern productivity standards.

This is not hard to achieve, just need split view with existing UI components.