This option you can find in the installation directory (help documentation) of the software and you can use it for the application while editing your config.pro file.
Category | Description | Values | Default value |
Data Exchange | Controls whether the enhanced entities (SPLINE and HATCHING) are converted to the corresponding DXF entities or represented as separate lines and polylines. | none, spline_and_hatch, spline_only, hatch_only | spline_and_hatch |