Kate no longer saves the document print margins. This means that each and every time the Printer Dialogue is opened, one needs to set top, bottonm, left, and right margins as one requires. Which is, putting it mildly, rather annoying :) By comparison to, for example, Kate Version 3.14.7 using KDE Platform 4.14.7 which stored margin settings, along with other "Kate Print Settings" in "~/.kde4/share/config/katerc": Snippet from katerc [Kate Print Settings][Margins] bottom=10 left=25 right=10 top=10
See also bug 406627, which currently contains a bit more info.
Fixed for KDE Frameworks 5.61.