I just printed out my first LibreCAD drawing and the majority of the
drawing is missing. It looks like it only printed out the elements I added
to the drawing today. The "Print Preview" shows the entire drawing. ???
Is this a layering issue possibly?
Standard line width is currently 0 in LibreCAD. This is to keep line thickness independent from zoom level.
Depending on operating system and printer driver it happens, that line width 0 is printed very faint or not at all.
So try to change line width to an appropriate value, as you would select a pen with the desired thickness.
When you did not change entities line width, which is 'By Layer' default, it is enough to change line width in layer properties.
investing less than half an hour into Search function can save hours or days of waiting for a solution
Depending on your printer, or printer software/driver, entities with linewidth 0.00mm, or Default, which is the same, may be printed very faint or not at all.
The same applies when printing/exporting to pdf, depending on the pdf-viewer app. Some such apps allow a choice how to handle hair lines.
Print Preview always shows lines 0.00mm wide.
Linewidth of entities is defined either individually by pen properties when drawing them, or as an attribute of the layer they reside on (pen property "By Layer").