How to extend a window over display/workspace in Yosemite Is there a way to extend a window over one display in OS X Yosemite, i.e. to make it larger than one display?
System Preferences -&gt; Mission Control -&gt; Untick &quot;Displays have separate Spaces&quot; and restart.

After restart, you will be able to have 1 window expand over 2 displays.