kmail columns width permanent change

Dj YB <[email protected]>
Newsgroups gmane.comp.kde.users.pim
Message-ID <[email protected]> 
hello,
I am trying to adjust the columns width to see better the subject.
however whenever I switch to another folder and back again to the same folder 
the setting are back the same as they were before my adjustments.
what should I do to make it stick?

thanks,
YB.
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