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How to remove lines between message headers?

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T-bird puts a line between message headers (see image) which makes for annoying loss of compactness. Can anyone point to a method to remove them?

T-bird puts a line between message headers (see image) which makes for annoying loss of compactness. Can anyone point to a method to remove them?
Attached screenshots

All Replies (3)

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Thank! Looks complicated. I love Thunderbird!

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It's actually quite straightforward

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Just did it and quite right, not that complicated. I'm just used to clicking on a checkbox or drop-down list and voilá!

But then, going back to Thunderbird is part of my divorce from Microsoft and Google (as far as that is possible) and that means brushing up on my DIY.