The software doesn't feature a reset button to bring all the values to the default mode. In some cases, it's enough to delete the INI or CFG files from the installation directory to force the software to reconfigure itself with default values. If there are no files in the installation directory, then re-install it. You will force the software to wipe all the custom settings and values.
Alternatively, download the PDF manual available through Google Search on Cab.DE website.