How can I switch my forms from static to video theme?

Ok thanks, that seemed to work. But I have a paid plan but some of my forms are in static, and I want them in video background. How can I switch them from static to video theme?

You can change the background of your form to show a video theme, only when you are using the Card form layout. Just open your form and select Form Designer.

You can use the Video theme, suitable to you from the "Video" tab in the Form Designer button as shown above.