Poster Printing allows you to print poster-size images by enlarging one page to cover several sheets of paper.
Draft for rough drafts with reduced print quality
Text for text-only documents
Text & Image for higher quality pages with text and images
Photo for good quality and speed
Best Photo for the best print quality
If you want to control the amount of the image that extends beyond the edges of the paper, click the Page Layout tab, select Auto Expand as the Enlargement Method, and then adjust the Expansion slider.
After completing the steps above, print one test copy and examine the results before printing an entire job. Then follow the instructions.
See
How to make a poster from your printouts.