How can I make the Unique ID field visible in my form?
The Unique ID will be generated only for the successful form submissions and it will not be displayed in the live form.
However as a workaround, you can include the unique ID field in the form submission PDF.
- Navigate to Settings > PDF & Document Merge > PDF Editor > Default Template.

- Click Form in the PDF editor.
- Click Show under Unique ID and Save.
You could also include this PDF in the Thank You page so that the respondents could download the PDF copy upon form submission.