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I believe you are referring to this guide (How-to-Hide-Empty-Fields-on-Email-Alerts).
Unfortunately, this option is not available in the new preferences wizard. A workaround will be accessing the form builder with the old user interface. You just need to add the string "&old" to the URL of the form builder in the address bar. Here's an example:
If you want to go back to the new wizard then you need to use this string "&test".
If you have any questions, let us know. Thank you.