Restrict form entries by allowing one entry per user

1. Open the form builder.
2. Click the Properties icon in the top-right of the form builder, as shown below. The Form Properties pane will appear on the right.

   

3. Navigate to the ​Form Properties > Restrict Form Entries​ section.
4. Check the checkbox next to Allow One Entry Per User, as shown below. A default Error Message will appear below it, which you can customize.