Hi @ajwbd17,
It seems that the app being opened is located on the primary display, the current connected spacedesk viewer is still the secondary display that’s why I suggested to move the window to your viewer screen.
If it’s not easy to do, you can also try display switch (Windows logo + P hotkey maybe for several times until it switch to single output/projector mode or duplicate so that the spacedesk viewer screen will become the primary display of the laptop.