RasPlex with Raspberry Pi official 7" display

I recently got the Raspberry Display 7" and was initially wanting it to act as a menu/control display with the video running out the main HDMI. It appears as though there are setting to control that, but it is based on GPIO which the display doesn’t use, rather it is just interpreted as an HDMI display albeit the scale is wrong. Any suggestions on perhaps getting the required results? I would be okay with it even just pushing video out both, but not sure because of the scaling issues that would work. Thanks for any input or help…