Are you referring to the ability to add empty values to a select list/dropdown? If so, we actually have it this way and allow users to do this on purpose, so they can have an empty state in their dropdowns. If you're referring to a conditional validation check in the prototype itself (like showing an error message if a user doesn't select anything from the dropdown): you can create an "On Focus Out" + "Show" event that will show an error message. Then, for that event, create a condition that is When... [dropdown element] = [empty]
And then create an "Else" event that will hide the error message.
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