Lock screen slideshow with multiple display

[JM_T]

I have an external monitor that I used with my Surface Pro (1). Before I upgraded, while in 8.1, the lock screen slideshow would be shown in both the SP display and the external monitor. Now that I've upgraded to 10, it would only show on the primary display which is, right now, the external monitor. Does anyone know if there's a way around this to show the slideshow in both displays?