I checked the result of printing printout of some of my projects - all trie
I checked the printing results for some of my projects - the printout looked ok (used also the builtin Microsoft Print To PDF driver). So until now this is not reproducible for me.
You could attach a small project. And include your used JSON color-file, because this could be relevant for this issue.
Your screenshot (first picture) looks somehow customized. My kicad default color theme has not that yellow background, and also not that black symbols and also not that black wires.
So this is most probably no generic “printing doesn’t works”, it’s specific to your schematic, maybe due to the use of colored graphics.
We need a example to reproduce the issue (and then decide if this can be fixed).
Note that z-ordering of objects (wires in front/behind of something) is not supported in kicad, so it could be that the result is different depending on the output device (display, print, plot).