When column layout is selected, there are 3 columns (folders, content of selected folder, and email window). Since the folder and content columns take up about half of the space and cannot be minimized, the email column is too narrow to view. Adding to this, the email font cannot be resized or scaled to fit in available space.

These features are available in every other mail app I have used; there is no reason the Proton UI cannot be at same level as competitors. Please correct this.