Run iPhone prototype on an iPad with *no* fit to width

When I run my prototype that is configured for an iPhone on my iPad, it stretches to fill the full screen width, which requires lots of scrolling to operate. Is there a way that I can prevent that from happening and keep it locked to the same iPhone aspect ratio on my ipad?

I also need them to fix this feature. My hi-fed prototypes are too busy for my iPhone to run smoothly, my iPad has an M1 chip and it would be a better UAT platform if it could be shrunk on screen to the size of a phone