Forms uses a responsive user interface that will shift and move to display an optimal user experience based on both the resolution (e.g. height and width) and orientation (e.g. portrait and landscape) of the device. This allows Forms to provide the best possible experience across multiple devices like laptops, tablets, and smartphones.
If Forms is embedded into your website using an iFrame, it is likely that your website is restricting the width of the page and adversely affecting the Forms user interface. To resolve this issue, follow the our steps here.