Units Change

Version: 2.2.0
Compiler: GNU GCC 12.2.0
Compiled on: Dec 17 2022
Qt Version: 5.12.11
Boost Version: 1.75.0
System: Windows 10 (10.0)

I am using DXF file.
I have a problem with changing units on the project ;/

I have a project in inches with few dimensions.
Next I click: Options/Current Drawing Preferences/Units
and change units to milimeters and click 'OK'

There is no updates on the scene and new units are drawn in inches ;/

LibreCAD doesn't recalculate the drawing to a new unit. You have to do this yourself manually. If a length has been 10 inches it will now be 10 mm. Only the naming and according settings for dimensions are changed. You have to rescale the whole drawing with factor x25.4.
See here for the procedure of conversion in the other direction: https://dokuwiki.librecad.org/doku.php/usage:howto#how_to_convert_from_mm_to_inches 

oh, didn't know it.

ok, thanks for answer!