Not exactly a feature, but I would love to see the Proton apps in a kind of transparent design philosophy. On the website, there are pictures of, for example Proton Mail, where messages are highlighted in transparent and a bit see through. There are so many examples of it on the other apps too, on the website and the pictures of those Proton Products. I think it would be great, if the UI matches those transparent elements, like they’re on the website!
PS: Great work you guys do, love your products!