So the Polish translation is "less or more"?
Yes, the idiomatic phrase is "less or more" or even "less more".
Lub or Czy?
"lub" or "albo" in a declarative sentence, "czy" in a question.
Also the suggested answer doesn't have anything because that's a fixed phrase and not a real "or", although of course you can interpret it literally.
So why is it written( more or less) Please
Sorry, what's the question? The English idiomatic phrase is "more or less", that's just how it is.
why can't it be Wiecej czy mniej?