I am trying to create a landscape certificate of completion

I am trying to create a landscape certificate of completion. do you have a certificate template for that?

You can change the Width of your form in-order to make it landscaped.

Here's a sample form with Landscape layout just by increasing the Form Width.
https://form.jotform.com/80553956236968

You can check the guides below that will help you build your first form.

https://www.jotform.com/help/2-How-to-Create-Your-First-Web-Form

https://www.jotform.com/help/300-Form-Designer-Tutorial-Let-s-create-fantastic-forms-

Please let us know if you need help with your form, we would be glad to assist and guide you.

Thanks.