Posted by dellus on Dec 09, 2020; 8:05pm
URL: https://forum.librecad.org/Isometric-drawing-dimension-tp5719832p5719837.html

What you want can not be done in LibreCAD.
The screenshot of the example you show probably has been made from 3-D CAD program where you can draw the dimensions in the according views / planes and then turn the whole thing into an isometric view.

The length of the upper piece of the plate probably is right, just draw a line parallel to the bending edge with a distance of 2.5 units and see where it lies. The angle also is indicated properly, as LibreCAD is a 2-D program and can't know what the angle would be in a straight side view.
The isometric grid is just an aid to easily draw 30/60 degree lines, but you can't really draw these with 3-D coordinates.