Restrict Blank Form Submission with Fluent Forms
Blocking users from submitting blank forms is easy. Enabling this functionality also enables you to block out spam.
- Go to Settings of the form you want to be free from blank submissions.

- Go to Form Settings & Integrations>Scheduling & Restrictions (scroll down)

- Toggle on “Deny empty submission” in Empty Submission Blocking.
- Define the message to be shown to users when a blank form is submitted.

- Save Settings.