Preview your form design
In the form editor, you can use the preview mode to see what your form looks like on mobile devices, tablets, or desktops before you save or activate it. This can help you to check your form's content and design when you are adding more items to customize it. You can see the result of your changes as you make them.
To preview a form design:
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In the editor, navigate to the form page you want to preview.
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On the top menu, click Preview. The editor switches to preview mode and shows the first form page.
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Click the preview icon that corresponds to the device you want to preview your design on. You can choose Mobile
, Tablet 
, or Desktop 
preview. -
To see the other pages of the form, click on the buttons you created to move between pages.
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To return to editing your design, on the top menu, click Edit. The editor switches back to edit mode.
If you fill in the fields of your form and click the submit button, Forms will automatically validate them. For more information on how to test your form, see Working with webhooks.