1 Day Alerts for Events
When entering an event we can choose: At the Time of Event, 10, 20, 30 minutes, 1 Hour, 1 Week or Custom. There isn't an option for "One Day", which is rather bizarre to my mind. Of course you can go into "Custom" every time you set up a new event but that is a royal pain in the ... er... neck! So much so I made the effort to come here! This a really simple upgrade Proton... pretty please!
This is already possible. In the web UI you have days as an option directly and in the iOS app you can select number of days under custom.
I'd agree though, that I'd rather have the 1 day before than 1 week and switch the weeks to custom-only.