The input field that should not be empty is not working. I’m creating a registration form where each group appears when you press the next button and the other group appears. There are 5 in total. Most of the fields are mandatory and I can still register without filling out anything. I’m not using pop-ups in any of these steps.
You will need to put a conditional rule on your button to allow it to only be clickable once all the steps are done 
But why isn’t this option working? Is something that I’m doing wrong?
It will only stop submission if the workflow the button triggers contains this input:
So unless you’re using the button that way, just add a conditional like I mentioned
