Adobe Community Professional, Dec 21, 2020Dec 21, 2020
Warren Heaton • Adobe Community Professional, Dec 21, 2020Dec 21, 2020
As the document background is meant to be non-printing to save ink, you'll need an object with the desired fill color.
As such, a rectangle drawn with the Rectangle Tool is a good option.
If you're not already using Master Pages, that's a very quick way to get the background of several pages to be filled with black or any other color.