When i set hidden value against fields data value lookup 'No' and then when i search in insight and typing these field name then data is displayed where as data should not be displayed because i set hidden in visibility column
where as here visibility hidden means fields should not be search in insight when set hidden value..
Just make sure you refresh the Insights page after selecting to hide a field or data value lookup. Until it is refreshed you will continue to see it appears in the Insights dropdown.