Form builders can add a confirmation email input to an Email element. This requires form submitters to validate that their email address matches their original entry.

Instructions
Navigate to the Forms tab and select the applicable form or create a new form

On the Builder tab, add an Email element to your form

Add a Label for the element

Expand the Advanced section and enable the Requires confirmation toggle

Click Save on the form

The confirm email field will now display

Note:
The confirmation field name will use the label you added to your email element.