Thanks for the pointer, Skinny. Should have spotted that myself. I'm posting a screenshot for those other newbies who don't find that right away.
When I multiply models they are printed sequentially or together seemingly randomly but I cannot find where to define this. It causes me a lot of trouble, since sequential printing is a must for flexible filaments. I saw gr5's suggestion of setting the gantry height to 0 but this is a tip intended to force all copies to be printed at once. I have 2 small spheres (see gcode) that I want to print sequentially. Where do you to set this.