Hi @ladysinaz
If you want to print onto only 1 page, you must select the page size according to the paper your printer uses. In this screenshot, I’ve put 2 facings onto an A4 page:
And you can see in the tiled preview, they are both printing on 1 page:
The trick is to play with the margin widths until you get them to fit without going into the area of paper used to match up and join the pages after printing.