User Manual For Librecad 2.0 -

: Look at the very bottom left; LibreCAD often tells you what the next step for a tool should be (e.g., "Specify first point").

To add measurements, use the tools (Aligned, Linear, or Radial). These automatically pull the scale from your drawing.

Assign a and Width (e.g., 0.5mm for main outlines, 0.25mm for hatch patterns).