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You can control whether or not external users are allowed to collaborate with users in your organization on a form or quiz.
On the Microsoft Forms pane, the Share setting has three options:
- Send a link to the form to people outside of your organization and collect responses from external people.
- Collaborate on the form (e.g. edit questions, change the theme design) with people outside of your organization.
- Share the form as a template so people outside of your organization can duplicate the form for their own purposes.