If a Picklist type field is set as required, Salesforce does not display the --None-- value in its drop-down list.
Even though the Picklist type field on the Call Discussion object is set as required, the --None-- value displays in its drop-down list on the Call Discussion section of Call page.
This is currently working as designed.
Although Salesforce does not display --None-- when a Picklist type field is set as required, Veeva makes it explicit that a user needs to enter a value for a required field.
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