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The FALSE for "National and International" should be updated to TRUE, as the other results return results when the parameter equals that value AND the field equals that, so if we want all the values to come through, then we need to return a blanket TRUE.
or something like this:
WHEN "International" THEN [Type of Visitor] = 'International'
WHEN "National" THEN [Type of Visitor] = 'National'
When 'National and International' THEN [Type of Visitor] = 'National' OR [Type of Visitor] = 'International'