Yes those settings are stored in your LW preferences folder in your. To find them, check Deleting LW Preferences folder in OSX. It's in your user account.

Download history is stored within two files called Downloads.dat & .bak inside your incomplete folder. Without those files your incomplete files will mean nothing to LW, even if a file is 90% downloaded. Unless you have a lot of incomplete files, it 'might' be worth deleting those files. At least in versions of LW prior to 4.17 that's where they were found, I heard in the later versions they are no longer stored there. I am not sure.