You didn't make your question clear.

Is there any ellipsis and box garbled in the printed paper document?

If so, I don't know why. Maybe you pasted garbled words in the original text, or there are characters in your paper that the printer can't recognize.

Or is there an ellipsis and a square in the electronic version (the color of this symbol is lighter than other colors, so you can't see it when you print it)

If it is the latter

Removal method:

Tools-> Options-> Just tick off the "space" in the format label.

These are marks in some formats, which are usually beneficial to tick, and some extra spaces can be found (ellipsis is half-width space, box is full-width space)

Good luck.