Welcome to the forum and sorry for the slow reply.
I think what you mean is that if the user prints a page the
large images go outside the page margins but it looks OK when you
If that is the case it is because in the editor the width is
based on whatever you have set up for the editor, it is not
necessarily a page width. Look at the text wrapping in the editor
and in the printed page. Your image is to wide but it looks OK in
the editor because the width you have set is more than a page.
Look at a line of text in a printed topic and see where it
wraps. Now set the width of your editor to wrap at the same point
and I think you image will then be wider. You need to size it to
If that is not what you mean, please provide some more