For those formats such as DWF that support layers, AutoXChange 2020 will create a layer for each layer in the DWG or DXF file that has visible items on it. If the layer does not have anything visible on it, then no layer will be created. So, it is possible for the resulting file to have fewer layers on it than in the original file.
AutoXChange will maintain the layer status defined in the original CAD file. So if a layer is off in the original file then it will not appear in the converted file. Likewise, if it is on in the original file then it will appear in the converted file. The layer visibility state can be altered via parameters (see Layer Table, Layer On and Layer Off).