Choose Edit > Preferences, then click the DXF Export symbol. The following preferences panel appears for export:

You can set the following preferences for export:

Here you can select in which AutoCad version the file is to be exported. The setting should correspond to the target program.

It is also possible to select between 3D and 2D when exporting Bézier curves. POLYLINE elements are obtained in both cases. The 3D polylines are true curves, while the 2D polylines are exported as a polyline.