In the left pane, select 'App Shortcuts'.I figured a way to create a shortcut for that from another answer on AskDifferent which I cannot find the link to. Many people commented that they wish there was a shortcut for it. The answer has been taken from website's page. As soon as you place the first window into the Split View panel, the other side of the screen turns into a mini-Expose much like Mission Control, simply click the window tile you want to open into Split View for the other side here to immediately send it side by side into Split Full Screen Mode.When the window shrinks slightly and the background becomes highlighted, you’re about to enter Split View, while continuing to hold the green button drag the active window into either the left or right panel to place it full screen there.Click and hold on the green maximize button of an active window (for example, a Safari window).Apple has provided this functionality as part of its OS X El Capitan.
