When you extend the windows desktop you will have your icons on the main monitor and just a background picture on the other just drag the program over to the extended monitor.
If you just want to use one monitor/TV screen at a time just switch the monitor/TV on that you want to use before turning the computer it should only detect the one monitor/TV and use this as the main monitor. This may not work on some of the older cards.
Or when you have selected 'extend my windows desktop to this monitor' also put a tick against this is my main monitor.
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