Global settings refers to what the merge policy will be if you do not specifically specify one on the instrument level. Meaning, it will use whatever you select to use in Tools>Options.
Rollover dates are populated from the NinjaTrader servers. You can overwrite these dates with any date you want. You can plug in whatever value you want to use for the offset there.
You cannot use any of these rollover dates or any of these merge options when using ##-##. They are for front months expiries only.

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