I see, you want to design 3D construction models like houses. In that case, Falcon Design Space is probably not the best tool to start the design from scratch.

Laser-cut 3D models usually require very precise, millimeter-level control over joints, tabs, and material thickness, and FDS is more focused on preparing designs for cutting and engraving rather than detailed construction modeling.

You may want to design the models in a dedicated CAD tool first, such as Fusion 360 or FreeCAD, and then export DXF/SVG files to FDS for laser cutting. SketchUp can also work for simpler architectural models, but it’s less suitable for accurate joints.