Sometimes, the input provided in two form fields must be identical; for example, when you are asking users to create a password or to provide and confirm their email addresses. You can enable this type of validation in the Form Editor.
First, add the two fields in which the input should be identical. Then, click on one of them to open its Edit Field panel. Go to Advanced and tick the checkbox Match with the value of another field. In the dropdown list that appears, select the matching form field.
When you do this, the other field is also paired with the first one, in its own Advanced section.
In the live version of the form, if users provide different field values for the two fields, they get an error indicating that the input must be identical. The form can’t be sent otherwise.
Note: If the two fields are placed on different pages, then the matching is ignored.