On the iPad, if i have a lot of unread emails, it's a lot faster to go through them efficiently in Apple Mail than in Proton Mail because of the main screen format. 1: Showing the email list on the left side (with the option to show 2-3 lines of content), and 2: showing the selected email's full content on the right hand side, allows you to quickly see each email, then delete or move on to the next email without ever having to leave the main screen.