Except for the "autocheck" parameter, HPFS386 is not configured on the CONFIG.SYS command line. Instead, HPFS386 uses a separate text file called HPFS386.INI, which usually resides in the \IBM386FS directory on your boot drive. The location of that file is specified on the CONFIG.SYS line instead.

HPFS386.INI contains too many parameters to be displayed here. Instead, the configuration dialog inserts a WPS object for the HPFS386.INI file into the dialog, which works just like any other WPS object. That is, you can right-click on the icon and use the "Open" menu to have it opened with some application, or you can drag the icon to your favorite editor. Once you save the changes in your editor, the settings will take effect at the next reboot.

HPFS386.INI contains a lot of comments which explain the various settings.