Hi Ryan,
Thanks for your interest in Syncfusion components.
We have tested our UWP report viewer application in your provided resolution (3840 X 2160) and it rendered the report properly without any issues. However, due to unavailability of Microsoft Surface Hub environment, we have not validated our report viewer in Microsoft Surface Hub, meanwhile could you please provide us the report viewer XAML codes used to render the report viewer control along with the output snap. It will be helpful for us to provide the solution at the earliest.
Regards,
Vinoth S.