How can I restore a field that is missing from the form?

Hello,

I was looking at my forms and I used to have a total on the top of page three but is does not seem to be there anymore.  I am not sure if I accidentally deleted it or what but if you look on my form from 2015 you can see that the total was there and the one on 2019 is not showing that.  How can I retrieve that and ensure all my totals are correct so that customers are charged correctly?

Thank you 

The "Total" field in the 2015 form is a calculation field:

https://www.jotform.com/help/259-How-to-Perform-Form-Calculation-Using-a-Widget

If a field is missing from the form that used to be there, check your form revision history and see if there is a version where the field is present:

https://www.jotform.com/help/294-How-to-View-Form-Revision-History

If there isn't a version where it is present, the field would need to be added to the form then the calculation set and checked to ensure the totals come out correct.