New Form Field not showing up on submitted form

Where are you not seeing it? In the listing or in the details of the submission? If it's the list, then you need to click the Columns button in the list view and check the box to show your new field. If it's the other details view, then you have something wrong with your configuration.

Do you mean the form shows 'No item to display' when you preview the app?

That is because you didn't bind the record(you want to edit) to the Form, so the form shows 'No item to display' when it is in Edit Mode.

The solution is that if you want to edit the existing record, you need to set Form to Edit Mode and configure the Item property to the record you want to edit. for example: bind the form the the first record of data source, then set Form.Item property to First('Data source') .

If you want to create a new record, just need to set Form to New mode.

You can switch the Form Mode in property panel, also you can try with EditForm/NewForm function.

Thank you Brenden Kehren & Joe Mama for your replies. Perhaps I was not clear in my question. An "Urgent Request: Have a Sales Rep Call Me" checkbox field was added to an existing form. I am able to see the field in the form on the live site. But, when a form is submitted by a site visitor, a copy of the form goes to a company email. The submitted form does not contain the new field that I added. So if a visitor ticks the box Urgent Request "Have A Sales Rep Call Me", I can't see it on the submitted form.

So, how is layout for the notification email configured? If there is a custom layout set, the new fields are not added automatically.