Desktop disappears when applications are opened

I spent part of this afternoon assigning rules for moving emails to folders in Apple Mail (ver 2.0.7). After restarting, now the desktop disappears everytime I open an application, and I must go back to the dock to move between applications, since only one application's window appears at a time on the desktop (though it is possible to have two windows from the same application open--for example, two pdf files with Adobe Acrobat.)
It's as if the system is operating before the invention of the multifinder, in the bad old days when you had to go back to the finder in order to move between applications. With this problem, the application stays open, but the window of a different application from the current one can only be viewed by returning to the dock and selecting the application. And only one application window can be seen at a time.
Everything was working fine before I spent the day trying to clean up my huge INBOX on Apple mail.
I have already deleted com.apple.finder.plist, and was thinking of trying to reset the PRAM.
Thanks in advance.

I did not notice that I was in full scree mode. Yes that the issue, out of full screen it works like before.
Thanks a lot for the hint.

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When emails are opened I cannot move them to another desktop

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Looks like that when emails are opened they cannot be moved to another desktop and does not allow me to open another email.
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I did not notice that I was in full scree mode. Yes that the issue, out of full screen it works like before.
Thanks a lot for the hint.

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================
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