When you mark a field as required in Object Manager, the field is universally required to save a record on that object in the user interface. However, the field is not required to save records via the API on that object, unless you also mark it as required on the page layout.
[References: https://help.salesforce.com/s/articleView?id=sf.fields_about_required_fields.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.admin_profile_picklists.htm&type=5, , ]
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