Posted by duncan.lithgow on
URL: https://forum.librecad.org/Print-preview-fit-to-page-tool-tp5720122p5720124.html

What do have set under Options > Current Drawings Preferences > Page? And what version of LibreCAD are you running?

Does this discussion help? I searched online for "Invalid paper size LibreCAD"

https://forum.librecad.org/Printing-out-drawing-td5713811.html