Need help with my display settings

[Max-Powers]

I have 2 displays. Primary and secondary. Sometimes I will disable the Secondary when I don't need it. My problem is, windows will automatically switch the desktop to the secondary display when I turn off my primary display. This is a HUGE pain. How can I make this not happen. My secondary display stays on, and I make it black by disabling it. It is not an option to manually turn off the secondary display. When it is disabled, it just not do anything.