Did you ever build a Formidable Form using the reCAPTCHA and then test it on mobile devices? Of course you have! The reCAPTCHA doesn't fit and extends over the edges of the forms. This is because the reCAPTCHA is set in an iFrame with a width that can exceed the width of its field container. When that situation occurs, there is a fix!
The following code snippets, when added to your theme, will resize the reCAPTCHA's iFrame to fit properly on mobile devices.
Add this CSS to your theme's style.css or add it to the WordPress Customizer/Additional CSS section:
Change the #frm_field_xxx_container to your form's reCAPTCHA container at line 9 in the below jQuery and add it all to the After Fields section of the forms Settings/Customize HTML page: