Imposition can require practice, especially when it comes to printing out correctly. For this it is useful to be able to have test documents with known properties.

Choosing Create Sample Document gives you a choice of page sizes and number of pages. Each page of the sample document is filled with light grey and has a thick border and large page number. Each page also has lines 20mm and 1 inch from the edges, so you can check if pages are being cropped when you print, and how much the page shifts.