What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
The Unique ID widget can be hidden only, but there is another widget that will be shown on the form, here is the link to the widget: https://widgets.jotform.com/widget/random_value_generator
This will generate a value that you can also customize.
Also, the Unique ID widget can be shown, but only on emails and Thank You page, to show the field's value on your Thank You page you will need to include it from the Form Fields drop down:
Hope this helps.