When you import to-scale CAD files to JigSpace, they can retain their physical size properties to appear at real-world scale in Augmented Reality.
Ensure you update to the latest version of JigSpace (JigSpace 3.11) to ensure objects retain the exported scale when you import them.
Real-world scale
The canvas floor of the JigSpace editor has a default 1x1 meter grid to help guide your presentations to appear natural in the real world when viewed in augmented reality.
You can still have objects larger than 1:1 scale, to zoom in on fine details, or sub-objects in more detail.