Last year, we announced that form creators can upgrade their existing forms to have granular controls over who can respond to those forms via sharing settings.  Specifically, form creators can limit response access to specific users, groups, or target audiences, similar to how file owners can restrict the sharing of Google Docs, Sheets, Slides or Sites files in Drive. 

We’re excited to announce that we will now automatically upgrade all existing forms to have granular controls over who can respond. This automatic upgrade will not change who can access or respond to the form. Once the upgrade is complete, form creators can make changes to who can respond using the new granular controls, if desired. The form will remain available to receive new responses while it is being upgraded. Admins may see Drive log entries for forms we upgrade, indicating that we've changed its "publish status.”

Form creators can control who can respond to existing forms by sharing to specific users or groups

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