Posted by dellus on Feb 26, 2019; 10:58am
URL: https://forum.librecad.org/How-to-set-drawing-scale-as-1mm-175mm-tp5716994p5716996.html

If you want to let the drawing otherwise be as it is, you could set "Length Factor" in "Current Drawing Preferences" - "Dimensions" to "1/75". This manipulates the reading of the dimension text. But if you measure it in the drawing, it will give the original value.
The better way, and how it is generally done in CAD, is to draw in the real dimensions, so in this case to draw that office box 23635 mm long. If you don't want to redraw everything, or got it from a different source, you can scale up the whole drawing with Tool - Modify - Scale.  Your dimension lines will have to be rearranged a bit after that.
The downscaling to 1:175 to fit onto A4 is done in the printing process. Open Print Preview and set the scale to 1:175 at the drop down menu (type it in). Then drag the drawing to the right position on the A4 sheet and click on Print while still in Print Preview mode.