Running Cura 3.2.13 in Debian GNU/Linux (Stretch)
After loading a model and properly scaling and centering it, multiplying the selected model generated the new copies out of the build area.
Presumably we prefer the models to populate in the print area first.
In the picture below, step one of making multiple copies of the model:
In the picture below, the three copies are out of the build area to the right: