Is there any way to remove this button from the page?
I've seen from this similar question that you can potentially limit by permission, but if that's not possible, is there a programmatic solution?
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We eventually applied a custom validation rule on the Lead to control the values that can be used by the user dependent on their profile. There doesn't seem to be a proper LEX programmatic solution and so we have to wait for Salesforce to open up configuration options on the page.