You can enable the Multiple Responses collector option when you're using the Web Link collector, Website collector, or Social Media collector.
To turn on Multiple Responses:
Response editing is limited when both Multiple Responses and Response Editing are on. People can only edit responses while they’re taking your survey—they can't edit responses after it’s completed.
The Facebook Messenger collector, Manual Data Entry collector, and Kiosk collector are meant to help you collect responses from multiple people, so there isn't an option to disable Multiple Responses.
By default, Multiple Responses is turned off for most collectors, meaning the survey allows only one response per browser or email address.
When Multiple Responses is off and someone tries to take the survey again using the same browser, they'll see a message that they already took the survey.
If the survey-taker's browser is set to clear cookies each time it's closed or they access the survey on a different browser or device, they’ll be able to take the survey multiple times.
There isn't an option to allow multiple responses for email invitations. Each contact can only respond to an email invitation once.
If you want a contact to take the survey more than once, create a new Email Invitation collector.