Contact Application
I suggest that Proton develop a contact application similar to the Contact application that Apple has.

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Anonymous commented
I don't know what Contacts application Apple has (depends on what email application you are using, right?)
But any contact application is currently better than the Proton Contacts interface. It's too disempowered (you can't do stuff to multiple contacts easily, and can't do ANYTHING to multiple contacts in a group view.
And that sidebar as the only interface? No. That is not adequate. At least something that is half-screen or a whole window. Contacts management, believe it or not, used to be better in many ways in Protonmail. It seems to be getting kludgier and kludgier. I feel like I have my hands tied when I use the interface.