Originally Posted by YongrokK
Mac OS 10.9 Mavericks has introduced a new feature, "space per display", which is fully supported in the latest Parallels Desktop 9 update only (from the revision 9.0.23136.932290).
So, to use multiple monitors in Parallels Desktop on Mavericks, the options are
1. Upgrade to Parallels Desktop 9
2. Turn off the option "Displays have separate Spaces" in "System Preferences->Mission Control". Please note that this would affect all programs on Mac OS.
3. Turn off the option "Use native Mac OS X Full Screen" in the "Virtual Machine Configuration->Options->Full Screen".
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