Posted by dellus on Apr 17, 2021; 10:52pm
URL: https://forum.librecad.org/Drawing-parallel-rectanges-tp5720562p5720580.html

What does "that are 16" on center" mean, distance on axis?
If you want to use "Snap Distance", you need to draw a baseline first. It doesn't snap into nothing, only on an entity.
Better use Modify - Move/Copy and the command line. Specify reference point: select a corner of the rectangle with mouse.  -  Specify target point: @16,0   Enter.
You can even make multiple copies then.