Testing LEX in a Sandbox.  I'm logged in as a member of my sales team, not as an admin.  If I edit a lookup field, I am given the option to + New Account when the field is a lookup to the account object, or + New Contact when the field is a lookup to the contact object.  Is there any way to disable the ability to Add a new record? 

I see on this page:  https://help.salesforce.com/articleView?id=customize_ui_settings.htm&type=0 that "The Show Quick Create setting also affects whether users can create records from within the lookup dialog. "  But, in this sandbox the "Show quick create" is not selected, but users still see the create a record option from within the lookup field. 

Is this expected?  Is there some way to disable that capability?