Hello Matthew Baird.
Welcome to the Microsoft Community.
It looks like you are currently suffering from display issues with Forms on your cell phone.
Due to the scale of the mobile screen, there is a real possibility that the horizontal content will be out of range. In this case, you can try to have the user receiving the form on their cell phone turn on computer mode in their mobile browser and manually scale the form page, or use the phone in landscape, which may help to resolve the display issue.
Additionally, you can send feedback to the Forms team with suggestions about UI adaptation issues you are experiencing with mobile devices. This will help improve the cross-device experience of using Microsoft Forms, and your support of Microsoft products is greatly appreciated.
Best Regards
Eliac | Microsoft Community Support Specialist