Choosing a Gravity Forms Theme
Choose a Theme for your Forms
Once the plugin is activated, you will have an option to select a theme in your Form Settings > Styles Pro page. Each Form can have a different theme. You can use forms with more than one themes on the same page as well.
You can go to Form Settings > Styles Pro page from the Form Edit page.
On the Settings page, simply choose the theme using the select box and click Update Settings. Styles Pro theme should now be applied to your form.