Hi Scott,
Thank you for contacting Syncfusion support,
We have not ensured our control for dual screen reading in surface duo device so far. Hopefully, we expect that this will work in both Xamarin and Blazor Platform. Currently, we do not have the Surface Duo device with us to ensure our control. We will create the environment (emulator) to check the working of this support in our end once and will update further details on August 20th 2020.
Regards,
Ashok Kumar Viswanathan.