Apenas algumas referências, dê algumas tentativas.
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Pergunte ao site diferente: Feche a área de trabalho / espaços vazios [ 1 ] [10 de agosto de 2014]
You can speed this up and hold Option down and this will keep the (x) to close the desktops shown so you don't have to hover over the selected desktop and wait for it to show itself.
... else
The only way that I would think you might be able close them all at once without performing the above process is probably with an automator script or apple script.
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"Fechar os espaços de área de trabalho no Mission Control para Mac OS X rapidamente" [ 2 ]
There are other ways to close the virtual spaces but, remember, you can quickly close desktop spaces in Mac OS X Mission Control by holding down the Option key, this causes the familiar iOS style and Launchpad (X) close symbol to appear over the spaces which can then be rapidly closed.
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"Atalhos de teclado úteis para o OS X Mavericks" [ 3 ]
Close All Windows
Option+Command+W