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Hi Georgie,
It sounds like you need to place your form inside a container/section on your page. How this works depends on the page builder/theme you are using. The container/section will take up 50% of large screens, but on smaller screens, these containers will stack vertically, taking 100% of the screen width.
Your form should be set to take up 100% of the container.
I would recommend reaching out to your theme developer, or the support team for the page builder that you use for the specifics of how to do this.
Best regards,
Nathanael