I bought a SP3 (running 8.1) specially to use to read sheet music at the piano. Part of the reason I bought it is because of the automatic screen rotation as many pages of music look better in portrait. I recently bought an external monitor which I use when I use the SP as my work computer When I unhook the monitor and try to use the piano the screen rotation no longer works. It’s stuck in landscape. Is there something else I can do? Thanks!