how to change email header size

The e-mail header takes up a LOT of screen real estate. Is there a way to reduce the amount of space headers take up? Something like compact header in Thunderbird? Thanks.

I am sorry, but it is not possible at the moment.

+1. The email header is locked in position (It does not scroll up and out of the way as I read down the email.) It takes up about 15% of my vertical space.  It would be nice if it either scrolled with the message body, or if I could resize it, or if I could just resize the font and space really small to make it take up less than 15% of my vertical space.