Hi all - pretty basic question, sorry if it's a repeat, is there a way to remove the "New" option on a lookup field in Lightning (see attached)?  I've confirmed that this isn't controlled by quick create User Interface setting, my guess is that this is controlled by profile CRUD settings on the object of the lookup field (for example if you're on a Contact and you are adjusting the Account lookup field, you would need Create rights on the Account to create a new Account here)?  Is there a way to define this by originating object (say I don't want to allow Account creation from the Contact, but I want to allow it from the Opportunity)?  

The use case I'm trying to solve for a client is that they don't want Accounts to be created during the Lead conversion process.  A validation rule used to work for this in Classic mode (because the Account is automatically created in the background), but now with Lightning, users are actually prompted to create the Account in the lookup field on the Conversion screen which ends up creating the Account before the Lead is actually converted (they could in theory create the Account, then back out of the conversion screen).  I can't think of a validation rule that would prevent this because the Account creation is basically acting as an independent creation at this point.

Thoughts on this?  Am I missing something easy?  Thanks!