It doesn't necessarily resolve this enhancement, but it could be a worthwhile
quick first step. LibreOffice's current procedure for discovering how to stop
remembering Recent Documents is significantly less user-friendly than for most
other apps (at least on a Mac): go through all the Preferences, search through
all the Help, google the Web, read through a bunch of not-necessarily-helpful
stuff, and finally, learn that there is something called an "extension" and
that you have to install one.