You can save a GEDCOM to your desktop or anywhere else you like on your computer. What a printout would look like is a function of the software you're using to print it.
Unless your tree is relatively small, or you're using an industrial-size printer, it would have to be printed on multiple pages.
If you mean print it out from WikiTree, someone else will have to gives you that answer. I've never tried to do it from WikiTree.