the headers take too much space

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I am switching to eM from Thunderbird, and while generally pleased, have one or two critical gripes. here's one:

The message headers are simply too big. Compact headers should have the Subject:, From: , and the date, all on one very narrow line. Currently, in either layout, but especially "messages on the bottom", every email produces huge amounts of white space or long distracting lists of recipients. Is there a fix? If not, can there be one soon?