Posted by LordOfBikes on Nov 16, 2019; 9:28am
URL: https://forum.librecad.org/Tools-Not-working-tp5717969p5717974.html

When you have entered the distance correct, I see two more possibilities.
1. color schema
Have you changed the appearance of LibreCAD? Maybe, like in the before linked trimming thread, that the preview is there, but invisible because of changed colors.
2. relation between drawing or zoom factor and distance
Depending on the drawing scale or zoom factor the distance could be too small or big, so that the preview is not visible because it is off screen or on top of the reference entity.