Tried the plugin already; it doesn’t work appropriately.
The instructions to edit the functions.php work fine!
Will they be overruled by a theme-update?
NB. You need to put your blog-posts in a specific category, obviously.
Yes, sidebar lists, but also dropdown lists from frontpage tabs are double-spaced.
And there is extra space between the elements on the presentationpage; it used to be more compact.