Android Tablet Optimization
With the Pixel Fold and Pixel Tablet incoming, Google is pushing for apps to have tablet-optimized layouts when using a larger device. The layout of Proton Mail on Android works on tablets, but it is nowhere near as useful as the Gmail tablet layout

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Gareth Hughes commented
I have Proton Ultimate and have a Samsung tablet, the user experience is pretty bad in all the proton apps sadly.
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n_m commented
Yeah, the tablet version of the Android app (I don't know about the iOS one) is awful. Right now the menu sidebar takes up the whole screen and a column view is absolutely necessary. Not even the settings are showing in full screen.
Mostly I'm using the web app on my Tab S9 Ultra and the android app is only installed for notifications.
Generally, dear devs, you can consider adopting the layout from the web app.
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Hannes commented
... not to forget the Calendar app!