Only parts of the drawing appears on the print preview screen (lines are missing, text is missing, dimensions are missing.). How do I fix this?

The issue is with "Defpoints" layer, all objects that are not printed, are on that layer.

This is a default AutoCAD layer set as 'do not print' (as a rule don't use that as drawing layer).

To fix the issue, select all drawing objects and change their layer to 0.