• Check/uncheck the tool button (either in the menu, ribbon tab or in a toolbar) to enable/disable it.
• Tool modes:
  • Selection: displays the units for the selected guide objects.
  • Full: displays the units for all the guide objects in the scene.

The units scale (ie.: 0.5 cm, 0,1 cm, 45.0 angles …) can be changed for the selected guide object, on the modify panel. This will also change the snapping points in the guide.