This tutorial will guide you through the steps to re-enable “three finger swipe” on your Macs Trackpad so that you can switch bank and forth between Spaces (desktops).
Why this functionality was taken away I’ll never understand. Adding it back requires installing the very robust (and free) BetterTouchTool – so head over to their page and download the App. After unzipping the file, drag BetterTouchTool to your Applications folder to install it. Then launch it.