Track who opens

Are you referring to the users who open your forms?

You can use the Form Analytics to track the users who open your forms. This tool gets basic information like the number of submissions per day, month or year, the country where the submission is made, the device use, conversion rates and others.

Please check this guide for more information: Understanding-Form-Analytics-and-Ways-on-How-to-Get-Your-User-s-Info.

We also have Google Analytics widget. Here's a guide on How-to-Add-a-Widget-to-your-Form.

Hope that helps. If you are referring to a different issue, let us know. Thank you.