And here for future reference once more in greater detail with screenshots from Windows 11:
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Press the Windows key or Start icon on the Task Bar and type ‘sound settings’
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after pressing enter, the settings dialog comes up, scroll all the way down
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and press ‘More sound settings’
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in the upcoming dialog double click your BT-headset (or other wanted device), another window pops up
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Choose the Advanced tab
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Make sure that the option Allow applications to take exclusive control… is not ticked.
