The current mail header in Desktop/Web app wastes a lot of space. For most desktops PC the screen is pretty large and so the current mail header has a lot empty space.

At the same time the headers takes a lot of screen high. Especially with labels and info messages like mailing list or tracking protection on it.

With a 27" display often the message content dosnt start below 1/3 of the screen. Witch is prrety bad since the content usually is the important part of a mail.

In gmail in comparsion the mail header is ofthen half of the since compared to Proton Mail.

Please make the mail header more compact so the content has more space.