The ability to split the screen vertically and compare two documents side by side in Microsoft Word saves you the eye strain of flipping back and forth between.
. Hold down the full-screen button in the upper-left corner of a window. As you hold the button, the window shrinks and you can drag it to the left or right side of the screen. Release the button, then click another window to begin using both windows side by side. If you already have a window in full-screen view, you can still view it side by side with another window. Just open, then drag a window onto the thumbnail of the full-screen app at the top of the screen.
Apps that need more screen space to enter Split View might display a message that they're not available in full screen. You can on your display to give apps more screen space. Apps that don't support Split View at all show a zoom button instead of a full-screen button. If holding down the full-screen button doesn't enter Split View, go to Apple menu System Preferences, click Mission Control, and make sure that “Displays have separate Spaces” is selected.
In OS X El Capitan is it possible to use split view in anything other than a horizontal configuration. I usually work with two 1080p monitors side by side meaning that a horizontal split view has little use to me. In the past I've used which has been my go to, until this new feature was introduced (check it out if you're the kind of guy that needs pixel perfect window placement to satisfy your OCD). Is it possible to have the new split view feature in El Capitan work vertically or even better allow for more split views inside split views ( inception) similar to how iTerm2 splitting works?