When I receive an event invite through email, I only have the option to add it to my main calendar. This is really unhelpful, as I want to keep the events of my different email addresses separated into different calendars.
I even created a new calendar and set one of the addresses as the default, but an event sent to that address still won't end up in that calendar.

I generally like the "one inbox for everything" model of Proton Mail, but if that means that we lose functionality like this or the general ability to keep things separated, it's a major hindrance.

So either allow me to select a calendar in the email event or at least make it so the default email of a calendar is respected.