Perhaps you are confused between units, scale factor and zoom?
Note that progeCAD (and AutoCAD) units are arbitrary and can be utilized to mean whatever you wish:
How this geometry fits to your screen is controlled by the zoom factor which is controlled by the scroll wheel of your mouse or using the zoom command.
Please let us know if you need more information.
progeCAD support, tips and troubleshooting forum. progeCAD works very similar to some versions of AutoCAD. Moderated.