Usually options are saved on setting file "MultiPar.ini" under MultiPar's install folder. When MultiPar is installed under "Program Files" directory, your setting is saved in "MultiPar" folder under each user's "Application Data" directory. You may locate the folder at "System settings" page.
If you want to reset all options at once, delete the "MultiPar.ini". If you want to reset every options on a page, push "Reset" button at the page. If you want to reset a specific option only, just erase the line on the setting file.
Option window consists in the following 4 pages.