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Your neutrals and grounds need to be separate the neutrals should be insulated from the enclosure. The choice of terminations are, lugs that are insulated from enclosure are for the neutrals. The ones that aren't are for the grounds.
The upper lugs are Line connections. The lower lugs are Load connections.
That disconnect having 4 terminals uses the inside pair #2 for Line, the outside #1 for the Load. If you look at the pull out, you'll see the connections