Confused about arming HSM Night Intrusion

In HMS there is a section Configure Arming/Disarming using modes.
My confusion is that to disarm Intrusion-Away i have to select all modes except Away. So how does Night Intrusion get armed since it's listed in disarm modes? And if i leave out Night in the disarm option, then I'm in trouble if i return at night.

When i looked last night, Intrusion-Night was not armed.

Thanks

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