I used this command to try out an alternative finder.
defaults write com.apple.loginwindow Finder /Full/Path/To/Path\ Finder.app
I prefer the standard finder - but do not know how to get it back.
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I don't know. But I bet you can do both
defaults delete com.apple.loginwindow Finder
defaults write com.apple.loginwindow Finder /System/Library/CoreServices/Finder.app