Is the widget "Preview befor submit" available?

Hi, I need to know if the widget preview before submit is availible for use or not, because I add it to my form but at the moment to get the html code this disappear, Please can you help me to resolve it, Thanks

I tested the standalone version of the form and it is working:

You just need to press the button ver detalle:

If the form is embed on a website please let us know the url so we can test it.

Let us know if we can assist you further.   

Thank you so much, Now it's working.. amazing!!!