The Proton Mail app on Android currently only allows you to view your email list. On foldable devices or tablets, this makes the email view huge and the inbox selection stretches across the entire screen.

It would be nice to see a split screen for tablets, allowing you to select the emails on the left and the content on the right. Or select the inbox on the left with the email list on the right, so it doesn't look like an oversized smartphone app on a tablet.