m00min, I fully agree with you, but for some reason, back in January when the paragraph spacing setting was first introduced to Marvin (and it works wonderfully in Marvin!), Kris decided that
this particular setting --
paragraph spacing -- will be the
only aspect of formatting that will default to the
publisher setting every time you launch a new book in Marvin.
All the other formatting preferences -- font size, type, color, etc. -- get retained, "inherited" from the last book you had opened in your Marvin before launching the new book... but this
one formatting aspect, paragraph spacing, just always defaults to the publisher setting
initially. With a few presses of the button, you can, of course, adjust it to your liking, but it can get tedious to have to do it over and over and over again for every new book.
Please note that the paragraph spacing button shows a small dot when the paragraph spacing in Marvin is identical with the publisher's original paragraph spacing.
That will be the status for
every book when you launch it in Marvin for the first time.
I have, by now, grown used to this weird inconsistency in Marvin. If you feel strongly about this issue, though, you might open an issue over on
GitHub, and ask Kris to reconsider his choice from back in January.