Problem displaying pdf full screen with 2in1 pc when flipping the screen.

I have an Acer Aspire R15 2in1 pc running on windows 10 with a fresh copy of Adobe Acrobqt Reader DC. I have hundreds of pdf's that are set to open full screen.

They open fine when the PC is set with the keyboard out front like a normal pc. However, when I flip the keyboard back they open as a black screen. Any ideas would be appreciated. Thanks.