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You should be able to do a Repair (might require a full repair, which will reset all of the System items) to "reset" this system search item to the default configuration.
Use Tools | Compact & Repair | Repair database (might also need to check Reset all system information to defaults). Since I am not sure what might be configured incorrectly, you can try it first with a basic repair, if that doesn't resolve it, you can rerun the repair with the "Reset" option checked.
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