Parquetex the Preview function not only for viewing of pattern. Also it is an important part of creating an additional layer for advanced texture (as Gap helper or as additional overlay).
Post FX can also be used for the Preview layer.
If Preview function is used only for preliminary parameters set-up, for faster geometry rendering is not recommended to use large Columns and Rows values.
To use the Preview
Do one of the following:
When you change Preview geometry fill or stroke color, stroke thickness value, layer refreshing is required (disable/enable).
The Preview layer can be rasterized and exported to the image file with transparency.