Custom Form Style Template

Is it possible to create a custom Form Designer Theme that I can apply to the other forms in my library?

Hi,

If you want to create a form with the same design, you can clone the main form by following this guide: https://www.jotform.com/help/27-how-to-clone-an-existing-form-from-your-account

If you want to create a template and apply it to your other form, you can share the template and use it with your other forms. Here's a guide: https://www.jotform.com/help/157-sharing-a-form-in-the-form-templates-gallery