Sheet Size
What size sheet of paper are you printing on? This is one of the biggest choices that you make, in terms of printing your own books and zines. It’s determined by the type of printer you’re using, and also what paper you can get.
In Layout Department, it’s the first choice at the top left. The sheet sizes in the dropdown are A4 and A3 if your computer uses metric. Or Letter, Legal, and Ledger if your computer is using inches. You can change between metric/inches in the settings, and also set the default sheet size to whatever paper you print on most often.
Coming in the future in the paid version, you’ll be able to make custom sheet sizes for any other pages you print on frequently.