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On a multi select field how do I unselect fields?

set the value to null to unselect everything

use setValue or setText with an array of values you want to keep to unselect everything else

Thanks, what can I do if I want to remove all selected without over righting new ones

get the existing value in the multiselect field

alternatively create a new array with only the elements you want

I understand I can remove elements from the array but how do I remove everything? I set it to an empty array?