Login pages can be used to secure your form behind a password, or verify that the provided email is valid (and that they own it). Click + Add page, and choose Login.

<aside> 📝 Note: This feature is available on the Starter plan and above. Learn more about our pricing plans and advanced features here.
</aside>
https://www.loom.com/share/065be1b4f5bf47d887630111c1ad8a0e?sid=7457db5f-3f9a-462b-bc31-126c7d7f20bc
In the left-hand panel, you can choose between Email, Password, and Single Sign-On (SSO).
This is the default Verification type, which requires respondents to enter an email and verify it with a code sent to their inbox. The code is valid for two weeks.

You can also Restrict domains to allow only specific email domains. For instance, you can limit access to emails ending with @yourcompany.com.
Limit respondents to one form submission
Prevent respondents from submitting your form multiple times by toggling the Limit to one submission switch under Limit submissions.
Use databases to restrict logins
If your form is integrated to a database like Airtable, you can limit logins to respondents listed in that database and retrieve their records for use in the form. In the left-hand panel, under Integration, toggle the Connect to database switch and select your Base, Users table, and User email field.