QUESTIONIs it possible to change/remove the controls on a Nintex Form using Nintex App Studio?
ANSWERThis is not possible in Nintex App Studio, please see the link below to get a idea on the functionality of App Studio.
Nintex App Studio guide
Navigate to the list where the Nintex form was published and open the Nintex Form designer from the list ribbon. Within the designer, change or remove the control needed and then republish the form to the Nintex Mobile layout. If you are using a Responsive form, you don't need to select a layout and can just publish the form as long as the option to allow Nintex Mobile forms is enabled within the Nintex Forms settings.