Split View is a neat new feature in OS X El Capitan, but some users are reporting that they can’t get it to work after upgrading. While there could indeed be a more serious issue causing the trouble, it’s more likely that you need to make one small change in the way that Mission Control works in order to get Split View running. Here are the details.
How to Enter and Leave Full Screen Mode in Mac OS X
Full screen mode in OS X definitely has its uses, but it can be confusing for users accustomed to the traditional window-based OS X interface, especially thanks to some controversial changes Apple made in OS X Yosemite. Here’s a quick overview of how to use full screen mode in OS X, and how to get out of it when you need to.