I like using the "Column" view setting in the Proton Mail desktop application but the navigation bar on the left side of the app (where you select Inbox, Drafts, Sent, etc.) encroaches on the usable viewing area when trying to view emails. I use Windows 11 and like to "snap" my email application on the left half of my screen. Allowing minimizing/collapsing of this bar (similar to how Outlook allows this) would grant additional viewing space for emails.