How disable external display

How can i disable my external display on my Imac? I use the second output for my ntsc TV, but sometimes i dont use it. If its connected, sometime apps put windows on the second display and its annoying. How can I s/w disable the external display?

Joe,
The Mac "remembers" where windows are, and usually will not move them back if you disconnect your external display.
Generally what I do if I launch and app and can't see its window (because its on the non-existent external display) is click the "Window" menu, then click "Zoom". This usually brings it back to the main display.

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